App Wont Open on Your Vivo V27e? Here Are All Fixes | Dr.fone

App Wont Open on Your Vivo V27e? Here Are All Fixes | Dr.fone

Ariadne Lv13

App Won’t Open on Your Vivo V27e? Here Are All Fixes

It is not a very rare phenomenon where an App won’t open, crash abruptly or face trouble while launching on an Android device. Many Android phone users also add to the fact that whenever they try to launch an App, it keeps loading but does not run smoothly, as it should in normal circumstances.

In such a scenario it is obvious for Android Smartphone users to look for possible solutions for such a random error so that their App/Apps load and work normally.

Many people are also interested in knowing about the causes behind why an App won’t open or why multiple/all Apps won’t open. This article will answer your query about why won’t my App open on an Android phone by listing a few probable causes for the problem.

Here are all the fixes you need if an App won’t open on your Vivo V27e. Read on to find out all about why Apps won’t open on your Vivo V27e and solutions to overcome such a problem.

Part 1: Possible reasons for Apps won’t open

If you are an Android phone user and face a problem while trying to open an App on your device, you will ask yourself “Why won’t my App open?”. To answer your question and explain to you why an App won’t open on your phone, here are some probable and simple reasons to make you understand the real problem.

It is appropriate to tag our generation as smartphone addicts because we use smartphones for anything and everything. All our important information, such as photos, videos, audio files, documents, notes, calendars, emails, etc, are stored on our phones. This causes a major storage/space problem in our phones and a shortage of storage space is one of the main reasons why an App won’t open or why all Apps won’t open on your Vivo V27e. To see how much of your storage space is occupied by Apps, go to “Settings” and select “Application Manager”.

Application Manager

Settings

Another possible reason for Apps to crash or why an App won’t open is a possible data crash. This may occur due to an unstable internet connection or various other background software interruptions.

The causes for the problem to occur are many and no specific reason can be established as the only reason why Apps won’t open on your Vivo V27e. There are a lot of speculations about why such a problem occurs and persists, but it is more important to focus on how to fix if a particular App won’t open or if all Apps won’t open on Android.

Part 2: Quickest solution to fix apps won’t open on Android

You have already understood ‘why won’t your app open?’ at the start of this article. But, you are not happy with the traditional solutions to fix the app won’t open issue.

Well, in such a case Dr.Fone - System Repair (Android) can prove to be your savior. It resolves failed Android system update issues, crashing apps, and black screen of death. It can also get an unresponsive or bricked Android device or boot loop stuck device fixed with one click.

Dr.Fone - System Repair (Android)

Why won’t my app open? The quick fix is here!

  • This is the first software in the industry that repairs Android systems.
  • All the latest Vivo V27e tablets and mobiles are compatible with it.
  • With single-click operation, fixing the app won’t open problems is super easy.
  • No technical skills are needed to use the tool.
  • The high success rate for Vivo V27e Android device issue fixing.

3981454 people have downloaded it

Here comes the detailed guide to fix apps won’t open problem using Dr.Fone - System Repair (Android)

Note: When you are up to fixing apps won’t open issues, make sure to back up your Vivo V27e beforehand. These processes might lead to data erasing and you don’t want to suffer data loss this way.

Phase 1: Preparation and connection of Android device

Step 1: Post-installation and launch of Dr.Fone on your computer, you got to press the ‘System Repair’ tab. Connect the Android device later.

fix App won't open by repairing android system

Step 2: Hit the ‘Android Repair’ located on the left panel followed by tapping the ‘Start’ button.

start to fix App won't open

Step 3: Feed your Vivo V27e details under the Vivo V27e device information screen. Please check the warning and press the ‘Next’ button right after that.

select the android info

Phase 2: Repairing your Vivo V27e under ‘Download’ mode

Step 1: You got to boot the Android device under Download mode, as it’s important. The steps for that are as follows –

  • Android devise with a ‘Home’ button – Press together ‘Volume Down’, ‘Home’, and ‘Power’ buttons together for 5 to 10 seconds after turning off the Vivo V27e device. Release them afterward and click the ‘Volume Up’ button to get into the ‘Download’ mode.

boot android in download mode with home key

  • When there is no ‘Home’ button – Turn off the Vivo V27e device and then for 5 to 10 seconds, keep the ‘Volume Down’, ‘Bixby’, and ‘Power’ buttons pressed. Tap the ‘Volume Up’ button after releasing all the buttons to enter the ‘Download’ mode.

boot android in download mode without home key

Step 2: Hitting the ‘Next’ button starts downloading the Android firmware.

fix App won't open in download mode

Step 3: Once Dr.Fone - System Repair (Android) verifies the downloaded firmware, it begins fixing the app won’t open the issue asap.

fixing App won't open

Part 3: 3 Common fixes if a particular App won’t open

In this segment, we will discuss the three best ways to help you fix the problem if only a particular App won’t open/launch/ run and takes an indefinite time to load.

1. Update the App

It is always advisable to keep your Android software as well as your Apps up-to-date and you must constantly check for any updates which may be available in the Google Play Store.

Follow the steps given below to update the app which won’t open on your phone:

• Visit Google Play Store on your Vivo V27e.

Visit Google Play Store

• Now select “My Apps & Games” from the main menu.

select “My Apps & Games

• In this step, you may click on “Update All” to update all Apps for which an update is available or manually select the Apps which you wish to Update.

Update All

Once the App is updated, close all Apps and tabs running in the background. Now try to launch the app once again. If it opens, your problem is solved. If not, DO NOT worry as there are more ways to help you.

2. Force Stop the App

Closing the App completely which won’t open on your phone is a good idea. To make sure that no operations are running in the background related to the App, you must “Force Stop” it. Doing this is extremely simple and all you need to do is follow the steps given herein under:

• Visit “Settings” on your phone.

• Click on “Apps” to see a list of all the Apps on your Vivo V27e.

Click on “Apps”

• Select the App which won’t open.

• Now click on “Force Stop” as shown below.

click on “Force Stop”

3. Clear App Cache and Data

This method resolves the issue to a great extent by wiping off unnecessary App content from your device.

Carefully follow the step-by-step instructions given below to clear all App cache and data:

• Visit “Settings” and select “Apps”.

• From the list of Apps that appears, select the App that won’t open.

• Now tap on “Clear Cache” and “Clear data” directly or under “Storage”.

Clear data

Part 4: 3 Common fix if all Apps won’t open on Android

In this segment, we will discuss solutions to the problem if all your Apps won’t open. They are simple and easy to follow and solve the error in no time.

1. Android updates

Firstly, it is very important to keep your Android software updated at all times as an old Android version might not support new Apps or updated Apps.

To update your software:

• Visit “Settings” and keep going downwards.

• Now select “About Phone”.

• From the options available on the screen, tap on “System Updates”

tap on “System Updates

• In this step, if you are prompted for an update, follow the instruction given and do so.

Updating your Android software solves most of your problems. This method might sound weird but works wonders when it comes to App related issues.

2. Restart the phone

Restarting your Vivo V27e to fix an error might sound old school but it gives good results when your Apps won’t open. Restarting your phone is fairly simple. All you need to do is:

• Long press the power button.

• Now click on “Restart”.

click on “Restart”

Your phone will automatically restart and once it does, you can try to launch the App. You may also restart your Vivo V27e by pressing the power button for about 15-20 seconds.

3. Reset Factory Settings

This method is a little tedious and must be last on your list. Also, make sure you take a backup of all your data and contents stored on your Vivo V27e and this solution will completely wipe off your phone making as good as a new smartphone.

To Factory Reset your Vivo V27e, carefully follow the guidelines given below:

• Visit “Settings” to find the “Backup and reset” option as shown in the screenshot below.

Backup and reset

• Now click on “Factory Data Reset”>“Reset Device”>“Erase Everything”

Erase Everything

Your phone will now reboot and will be required to set up from scratch.

“Why Won’t my App open” is a question asked by many Android phone users who fear that the problem occurs due to a virus attack or a system failure. However, this is not the case. The reason for the error to the surface is quite minor and can be fixed by you, sitting at home, without resorting to any kind of technical or external assistance. The solutions listed above are easy to understand and not very time-consuming.

So go ahead and try them out now!

How to Quickly Fix Bluetooth Not Working on Vivo V27e

One of the key features of an Android device these days is the Bluetooth technology. This is such an important part of the phone that many of us take for granted, but as soon as the feature stops working, it can cause all kinds of problems.

Fortunately, despite there being many reasons why a problem could occur to your Bluetooth feature, there are also plenty of fixes. Today, we’re going to share with you the complete guide that details everything you need to know to get your Bluetooth up and running once again as quickly as possible.

Let’s get straight into it!

Part 1. About Bluetooth Not Working on Android

Of course, the most common problem to occur with Bluetooth technology in your Vivo V27e is when it doesn’t connect to the Vivo V27e device you’re trying to link it to. This could be anything from a Bluetooth headset or headphones, to a portable speaker or even an in-car audio system.

However, the problems don’t stop there. You may have problems with turning your Bluetooth settings on through your actual device. Perhaps the software simply isn’t loading, or maybe the Bluetooth feature keeps turning itself off randomly.

Due to the complicated nature of Bluetooth technology, there could be many reasons as to why your Bluetooth feature is playing up in this way, but that doesn’t mean it can’t be fixed. For the rest of this guide, we’re going to explore the nine need-to-know ways you can fix the Bluetooth problems not working on your Vivo V27e as quickly as possible.

Part 2. 9 fixes for Bluetooth not working on Android

2.1 One click to fix Android Bluetooth issues due to Android system

Since Bluetooth is an internal technology, this indicates there’s a problem with the software or firmware of your Vivo V27e. If something’s broken, this means you need to fix it. Fortunately, there’s a quick and easy way to do this using software known as Dr.Fone - System Repair (Android).

Dr.Fone - System Repair (Android) is a powerful Android repair tool which is hailed as many as being on the best software applications in the industry. With all the tools you need to repair your phone not just for Bluetooth errors, but basically any internal firmware problems, this is a one-shot-tool that gets the job done.

Dr.Fone - System Repair (Android)

Android repair tool to fix Bluetooth issues in one click

  • Can fix most internal software and firmware issues
  • Trusted by over 50+ million people around the world
  • Supports over 1,000+ unique Android brands, manufacturers, and devices
  • Incredibly user-friendly and easy-to-use
  • Compatible with all Windows computers

3981454 people have downloaded it

To ensure you have the best experience while using the Dr.Fone - System Repair (Android) software, here’s a complete step-by-step guide on how it works when fixing your Android’s Bluetooth problems.

Step One Make your way over to the Wondershare website and download the Dr.Fone - System Repair (Android) software to either your Mac or Windows computer. Install the downloaded file by following the on-screen instructions. Once installed, open the software, so you’re on the Main Menu.

bluetooth not working on android - use a tool

Step Two Connect your Vivo V27e to your computer using the USB cable, wait a couple of seconds, and then click the System Repair option. On the Menu on the left, click Android Repair, and then press Start.

bluetooth not working on android - select option

Step Three Next, use the drop-down menus to make sure all the information about your specific device is correct, including your device, operating system number, and carrier information. Click Next to confirm your selections.

bluetooth not working on android - confirm info

Step Four When prompted, put your phone into Download Mode needed for repairs. You can do this by following the on-screen instructions which will depend on which device you have and the available buttons.

bluetooth not working on android - download mode to fix issues

Step Five The software will now begin the repair process. This will happen automatically, and all you’ll need to do is make sure your device doesn’t disconnect during this process, and your computer doesn’t turn off.

bluetooth not working on android - start repairing

When the repair process has been completed, you’ll receive the screen below, which means you can try again if the process didn’t work, or you can disconnect your Vivo V27e and start using it and your Bluetooth features.

2.2 Restart Android and turn on Bluetooth again

bluetooth not working on android - restart android

One of the most common solutions in technology is simply to turn it on and off again, which is the case to happen here. By restarting your device, you can clear out any problems you may be suffering from to help it get up and running again. Here’s how;

  1. Turn your Vivo V27e off by holding down the Power button
  2. Wait for several minutes and then turn your phone on again
  3. Wait for your phone to completely power up, so you’re on the Main Menu
  4. Navigate Settings > Bluetooth and then enable the setting
  5. Try to connect your Bluetooth device to what you were trying to do before

2.3 Clear the Bluetooth cache

android bluetooth problems - clear cache

Every service on your Vivo V27e using a feature called a cache. This is where information is stored to help the feature run properly and give you the best experience. However, over time this can get messy and can cause problems with your Bluetooth feature.

By clearing the cache, you can restart the service and hopefully clear up any issues or problems you may be experiencing.

  1. On your phone, navigate Settings > Application Manager, and you’ll see all the apps and services on your phone. Locate and select the Bluetooth service.
  2. Select the Storage option
  3. Tap the Clear Cache option
  4. Go back of the Menu and restart your phone
  5. Now turn your Bluetooth feature on and turn connecting it to your preferred device

2.4 Remove paired devices

android bluetooth problems - remove paired devices

Sometimes, you may have a problem with the Vivo V27e device you’re trying to connect to via Bluetooth, especially if this is a device you’ve updated. To counter and repair this, you’re going to need to remove the paired devices saved with your device and then reconnect them.

Here’s how;

  1. From the Main Menu of your Vivo V27e, head to Settings > Bluetooth > Connected Devices.
  2. Turn Bluetooth on, and you’ll see all the connections your Vivo V27e is paired with
  3. Go through these settings and remove/delete/forget every connection on your device
  4. Now when you go to connect to a device using Bluetooth, repair the Vivo V27e device, enter the passcode, and use a fresh paired connection.

2.5 Use Bluetooth in safe mode

android bluetooth problems - safe mode

If you’re having problems with your connection and paired devices, sometimes you may have conflicting software faults in your device that are causing the problems. If this is the case, you’ll need to boot your Vivo V27e in Safe Mode.

This is an operating state in which your phone will run the bare minimum services it needs to perform. If your Bluetooth works in Safe Mode, you know you have an app or a service that’s causing the problem.

Here’s how to find out;

  1. Hold the power button down, so the Android power menu turns on
  2. Long-press the power button again and the restart in Safe Mode option will come up
  3. The phone will automatically boot into Safe Mode
  4. Wait a minute on the Main Menu
  5. Now turn on your Bluetooth and connect it to your preferred device

2.6 Turn on the discoverable feature

android bluetooth problems - discoverable feature

To ensure your Bluetooth can connect to other devices, it’s important to make sure you’re making your device discoverable to other Bluetooth devices. If it’s hidden, other devices won’t be able to find it, and sometimes it can bug and prevent connections.

Here’s how to turn on your Bluetooth discoverable feature;

  1. From the home screen of your Android, navigate to the Menu> Settings > Bluetooth
  2. Toggle the Bluetooth switch, so it’s on
  3. Under the available settings, tick the box that allows your Bluetooth device to be discoverable
  4. Turn your Bluetooth feature on and connect to the Vivo V27e device you’re trying to connect too

2.7 Exclude Bluetooth issues of the other device

android bluetooth problems - exclude Bluetooth issues of others

Sometimes, you might not even have a problem with your Vivo V27e, but rather the Bluetooth device you’re trying to connect to, whether that’s a Bluetooth speaker, an in-car entertainment system, or any other kind of Bluetooth device.

By testing out another Bluetooth device to see if it will work with your preferred device, you can rule this out from being the issue.

  1. Disconnect your Vivo V27e from the Bluetooth device and turn your Bluetooth off
  2. Now take another Bluetooth device and connect this to the Vivo V27e device you’re trying to connect too. This could be another Android device, or even a computer or iOS device
  3. If the new device doesn’t connect to your Bluetooth device, you’ll know there’s a problem with your Bluetooth device, not your Vivo V27e
  4. If the Vivo V27e devices connect, you’ll know there’s a problem with your Vivo V27e

2.8 Place both devices within close proximity

android bluetooth problems - close proximity

One of the common misconceptions of Bluetooth is just how far the wireless range is of the service. You need to make sure your devices are well and truly close to each other to make sure a stable connection can be formed.

The further away the Vivo V27e devices are from each other, the less likely the connection will remain secure. As a rule of thumb, Bluetooth can work up to 100 meters, but to play it safe, always try and keep your devices under 50m apart.

2.9 Avoid interference of other Bluetooth sources

android bluetooth problems - avoid interference

The final consideration you’ll want to think about is that Bluetooth radio waves, or wireless waves, can interfere with each other. This means they can bounce off each other or get muddled up and make things confusing from your devices.

With this in mind, you’ll want to make sure you’re limiting the amount of Bluetooth activity in the area where you’re trying to use a device. While uncommon, this could be the problem.

To fix this issue, turn off all the Bluetooth connections in the area. This includes computers, laptops, mobile phones, tablets, and any other Bluetooth devices you may have. Then, try connecting your Vivo V27e to the Vivo V27e device you were trying to use. If it works, you know you were experiencing Bluetooth interference.

6 Solutions to Fix Error 505 in Google Play Store on Vivo V27e

In case you are receiving the error code 505 while downloading an application from Google play store and have no clue what is it, then this is the right article for you. In this article we are covering the reasons behind the occurrence of Google play error 505. Not only that, we are also providing 6 solutions to fix the error code 505. Usually, this error is seen with Android 5.0 Lollipop version and occurs at the time when you try to install the already downloaded application making it hard to run the app.

Such an error is a kind of permission error. That is, in case you have two similar kinds of applications such as banking apps and both looking for similar kind of permission, causes conflict error named as error 505.

The occurrence chance is more in the old operating systems, 4 KitKat, Android version 4. Let us then proceed to know more about this error 505.

Part 1: Reasons for Google Play error 505

error 505

As per the report by some users, error 505 occurs in certain apps such as Weather App, SBI, ITV, Adobe Air 15, We Chat etc.

To have the right idea about the problem, we have listed all the reasons of it occurrence below:

  • Google play store is not updated or refreshed (Causes the error during the downloading process)
  • Due to installation of an outdated version (In case your Android version is outdated may result in error in the installation process)
  • Cache memory(Is the redundant data occurs due to search history)
  • Application is not compatible with the Android OS (If the app you are downloading is not the updated may cause error)
  • Adobe air app
  • Data crash (Many time app or Google play store crashed crashes after downloading it, reason may be some bugs, so many apps are open, less memory etc.)

Now that we know the reasons, let us also learn about the solutions that will guide you to resolve the error code 505.

Part 2: 6 Solutions to fix error code 505

Any error that occurs during downloading or installation process not only hinders with the new app but also takes a large amount of our time to solve the issue. To check that, let us go through the 6 solutions one by one.

Solution 1: One click to make error code 505 disappear

The most common cause for error code 505 pop-up is that Android system files that underpin the Google Play module are corrupted. To make error code 505 disappear in this condition, you should have your Android system repaired.

Dr.Fone - System Repair (Android)

One click to repair Android system and make error code 505 disappear

  • Fix all Android system issues like error code 505, error code 495, error code 963, etc.
  • One click to fix error code 505. No technical skills required.
  • Supports all the new Vivo V27e devices like Galaxy S8, S9, etc.
  • Easy-to-understand instructions provided on each screen.

4,999,459 people have downloaded it

Now, you just need to follow these Android repair steps to fix error code 505:

Note: Android repair needs to flash the system firmware, which may erase existing Android data. To prevent data loss, back up all the important data from Android to PC .

Step1: Download the Dr.Fone - System Repair (Android) program , install and launch it. The following interface will pop up.

make error code 505 disappear by android repair

Step2: Select the “Android Repair” among the 3 tabs, connect your Android to PC, and click “Start”.

select android repair option

Step3: Choose the correct device details from each field, confirm them and continue.

select correct device details to fix error code 505

Step4: Boot your Android in download mode, then start downloading the firmware of your device.

fix error code 505 in download mode

Step5: After the Vivo V27e device firmware is downloaded, the tool will start repairing your Android.

fix error code 505 when firmware is downloaded

Step6: When your Android is repaired, the error code 505 will disappear.

error code 505 fixed successfully

Solution 2: Check whether Download Manger is ON or not

Many times download manager is set to disable due to which you are not able to download or install the app. So, it is required to make a check whether the download manager is set on or off. So that your installation process will work properly. The process to enable the download manager is as follows.

>Go to Settings

>Select the Application Manger or App (Option depends upon the Vivo V27e device)

At the top, an option will appear

>Swipe right till you locate Download manager at top of the screen of the Vivo V27e device

>Then Select Enable

Application Manger

Enabling download manager to give permission to the Vivo V27e device to start the download or installation process.

Solution 3: Updating to the latest version of OS of your Vivo V27e

Working with an old operating system is ok, but many times old version also creates some problem and is the main reason behind the occurrence of any bug or error. So, updating the older version act like a rescue to get rid of any such issue or bug. The Process of updation is quite simple; you just need to follow the below steps and your device is ready to get updated to the latest version. Steps are:

  • >Go to Settings
  • >Select about Phone
  • >Click on System Update
  • >Check for updates
  • >Click on Update
  • >Need to click on Install (if any update is available)

update

Solution 4: Clearing the cache memory from Google services Framework and Google play store

While browsing data online or through Google play store some cache memory get stored for the fast access to the pages. Below mentioned simple steps will help you in clearing out the cache memory from Google services framework and Google play store.

Process to clear the Cache memory for Google Services Framework

  • >Go to Settings
  • >Select Applications
  • >Click on Manage Applications
  • >Click to select ‘ALL’
  • >Click on Google services framework
  • >Select ‘Clear data and clear cache’

That will remove the cache memory of your Google services framework

Steps to Cache memory of Google Play Store

  • >Go to Settings
  • >Applications
  • >Manage Applications
  • >Click to select ‘ALL’
  • >Select Google Play store
  • >Clear data and clear cache

It will clear the cache of Google play store

app info

Clearing the cache memory remove the extra temporary memory, thus free up space for the further installation process.

Solution 5: Reinstalling play store Updates

The reason behind the installation error code 505 might be Google play store updates.

Due to continuous updation of new apps and services Google Play store used to be flooded with so many updates or sometimes does not updated properly. That sometimes caused the problem in dealing with app installation. Resolving the issue is important to make your play store ready for future updation and installation.

Google Play store

  • >Go to Settings
  • >Visit Application Manager or Apps
  • >Select Google Play Store
  • >Click on Uninstalling Updates
  • >A Message will appear ‘Change play store app to factory version’- Accept it
  • >Now Open Google play store>It will refresh the updates within 5 to 10 minutes(So you need to keep your internet connection on while Google play store is updating its store for new updates.)

Click on Uninstalling Updates

Solution 6: Third party App

In the case, error 505 occur due to the installation of two or more apps with duplicate permission of data, as many times we use to install two similar kind of app that creates the situation where both seeking out for somewhat similar permissions for the installation. The manual finding is a long and tiring process. Then you can take the assistance of ‘Lucky Patcher App’ to find out which app is creating the conflict. This app will assist you in finding out the duplicity if any and then modifying it. Through this app, once you will find out which particular app is causing the conflict, then you can delete that conflicting app from your phone so that problem of error code 505 gets sort out.

Download link: https://www.luckypatchers.com/download/

lucky patcher

Note: If still, you are in the state of trouble to solve the issue of error code 505 then Google Play help center is here to look out all troubles related to app store and its service. You can check out the details by visiting the following link:

https://support.google.com/googleplay/?hl=en-IN#topic=3364260

Or call them at their call center number regarding the issue.

call center number

Bonus FAQ about Google Play error

Q1: What is a 505 error code?

The HyperText Transfer Protocol (HTTP) error 505: HTTP Version Not Supported response status code means that the HTTP version used in the request is not supported by the server.

Q2: What is a 506 error?

The 506 error code is a frequent error when operating the Google Play Store. You will sometimes see this error code when you are downloading an app. The app may seem to be downloading just fine when suddenly, near the end of the installation, an error occurs, and a message pops up saying, “App could not be downloaded due to an error 506.”

Q3: How to fix the 506?

Solution 1: Restart your device which can help solve most problems.

Solution 2: Remove the SD card safely.

Solution 3: Correct date and time if it is wrong.

Solution 4: Add your Google Account again.

Solution 5: Clear Google Play Store data and cache.

However, sometimes the five simple couldn’t work anymore. A system repair software can be helpful quickly. We really recommend the Dr.Fone - System Repair (Android) , only a few minutes, the error will be fixed.

Conclusion

Not being able to download or install the app is very frustrating and time-consuming also. Therefore, in this article, we went through the reasons behind the occurrence error code 505 as well as resolving the issue by following five effective methods. I hope that you would be able to sort out the error 505 by following above methods thus would be able to install the application without further delay.


  • Title: App Wont Open on Your Vivo V27e? Here Are All Fixes | Dr.fone
  • Author: Ariadne
  • Created at : 2024-03-20 19:49:19
  • Updated at : 2024-03-21 22:46:43
  • Link: https://howto.techidaily.com/app-wont-open-on-your-vivo-v27e-here-are-all-fixes-drfone-by-drfone-fix-android-problems-fix-android-problems/
  • License: This work is licensed under CC BY-NC-SA 4.0.