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No matter where you are or which cellular carrier you’ve subscribed to, being constantly spammed with messages and calls from strangers and telemarketers is perhaps the one thing that draws our collective ire. Having your phone ring at an inopportune moment only to find that it’s another one of those pestering mules who’ve somehow got access to your number can be infuriating, to say the least.

Well, here are a few ways you can permanently block spamming numbers and keep them from stealing your precious time. These commons ways to block a number shall work on every Android phone, irrespective of the device’s OEM.

Method #1: Using the Phone app

Option 1.1

This is the simplest method to block a number on any Android phone. First up, tap on the Phone app and get to the section with your Recents calls.

From here, you can choose one of two routes to block a caller. The first one involves long-pressing the caller you want to block and select the Block option.

Option 1.2

For the second method, tap on the arrow next to the caller. On the next screen, tap the three-dot menu.

Option 1.3

Samsung devices:

On some devices including Samsung Galaxy phones, you need to tap on the contact’s name in the “Recents” list, and then tap the “i” button for more info, and then tap on “Block” in the bottom right.

If you have been prudent enough to save the intruder’s number, you can block him/her from your Contacts List as well. To do this, go to the Contacts section in your Phone app and search for the contact, and tap on it.

Method #3: Using the Messages App

Perhaps you’re not getting calls, but are bombarded by promotional messages that are making your message app clunky. This can make it hard to sieve the important messages from the chaff of spam. Here’s how you can block them from the Messages App.

Open the app and find the number that you want to block. Then, tap and hold on their photo icon.

On the next screen, you will have a big bold Block button for you to press.

And just like that, you’re free from that particular annoying number.

Method #4: Create a ‘Block List’

On Samsung Devices

Creating a ‘block list’ has been a feature of Samsung phones for a while now but they are yet to make an appearance on your stock Android devices. For this, open the Phone app, tap the 3-dot menu in the top-right corner, and then tap Settings. Now, tap “Block numbers” to open the menu for this feature.

Now, simply type the number you want your phone to block, and then tap on the “+” button. You can add as many numbers to this list as you want.

On Stock Android devices and other Android OEM devices

On other Android phones, you may have to get creative to create your own ‘block list’. This involves going to the Contacts page and creating a new contact named “Blocked”.

Thereafter, go to the contacts setting (the three-dot menu) and select ‘Block‘.

Now, every time you get a call from an unknown number, simply add that number to your Blocked contact. This may be a little cumbersome for some at first as you have to manually add the numbers and new ones do tend to pop up every now and then. But you can at least find solace in knowing that you won’t get any calls from the numbers that you have blocked.

Method #5: Use the ‘Call blocking’ option from your Cellular network

The problem with previous methods is that if you’re switching phones frequently, you have to start over every time you set up your new phone. This can be a huge hassle that not many would want to endure, even though you can rely on the sync feature on your phone to move the list of blocked numbers from your old phone to your new phone, provided you do sync your data.

Fortunately, your own cellular carriers can help you in blocking unwanted calls and keeping them blocked even when you change phones. The only downside with them is that they require you to purchase a subscription service for it.

Here are some of the most popular cellular carriers and their call-blocking services:

Do read the terms and conditions attached to these services as well as subscription charges (wherever applicable) to ensure that you don’t get tied to any of the clauses in the fine print.

Method #6: Use the DND feature on your phone to silence calls

There’s another method to ensure that you only get calls from contacts that you allow. This can be done by, first of all, switching to DND on your phone. Do this by pulling down the system tray and turning on DND.

Alternatively, open your Settings and select Sound & vibration.

Under Sound, tap on Silent/DND and then DND. Now, you have the option to “Allow incoming calls” from a select group of people. These can be “from anyone”, “from contacts only”, or “from starred contacts only”.

If you don’t want to get calls from unwanted callers, you would probably choose one of the two highlighted above. This method is an ingenious one as you don’t need to download any extraneous applications or pay for a cellular carrier subscription package.

Note: Using DND to allow only contacts to call will also block calls from unknown numbers that might not be spam including bank calls, calls from a new number of one of your contacts, someone trying to get in touch with you through a public line, etc. You can easily miss some important calls, so, choose wisely.

Method #7: Use a 3rd-party app

Thankfully, there are various third-party applications (most of which are free to use) that have multiple call-blocking features to simplify the task. We would recommend you give them a shot if some callers have become particularly annoying.

Warning: While widely used, these 3rd-party apps often have questionable privacy agreements that involve uploading and updating your contact list to the company’s data servers. If you are concerned about your privacy, you might want to look into this before proceeding further. You can get a good idea about such apps by looking at the permissions required by them upon installation on their Play Store listing.


Developed by True Software Scandinavia AB, Truecaller has been the go-to app for android users, not just to block calls but also to use the app as their default phone app. Much of this is due to its huge database of spam numbers which ensure that you won’t have to go through the drudgery of blocking any calls yourself – all the work is done by Truecaller for you. If any such calls do come through, you can always label them as spam and do yourself and the rest of humanity a world of good.

Download: Truecaller

Call Blacklist

The name says it all – an app to create your own custom blacklist to ward off unknown callers. It works both as a call and an SMS blocker. Call Blacklist lets you block calls and SMS from hidden and private numbers, even numbers that aren’t stored in your contacts list. The app can be password protected and also lets you schedule a time when you don’t want the spammers getting through to you.

Download: Call Blacklist

Should I Answer?

This call-blocking app is unique in its design, in that it gives you all the information you need to decide whether you should answer a call or not. Different types of callers – telemarketers, spammers, unwanted callers, etc – are categorized neatly and rated depending on other users’ interaction with them. You too can add a few to the ever-expanding database and block numbers yourself.

Download: Should I Answer

These are the tried-and-tested methods that are guaranteed to keep you from blowing your lid off the next time your phone rings, knowing that it is not from some random stranger or a computer-generated voice but from someone you know.

You're reading 7 Ways Block A Number On Android

How To Block Calls On Android

Sooner or later, you’ll come across someone who doesn’t know the meaning of personal space. When that happens, they keep calling so much that you feel you don’t have much choice but to block them. There are different ways you can block them. You can try using your integrated Android options, or you can use ESET Mobile Security. It has an option where you can filter your calls and block a private number of specific numbers. There is also an option to block the calls from a specific time frame.

How to Block Calls on Android Using Settings

If you don’t feel like using a third-party app or don’t use ESET, your Android phone has an integrated option for you to block unknown numbers and any number you add to the blocked list. To start, open the phone app and tap on the dots at the top. Go to Settings and tap on the Blocked Numbers option.

At the top, you’ll see the option to toggle on the option that will block any unknown numbers. But if you also want to block a known number, you can do that by tapping on the Add a number option. Add the number and tap on the Block option to save your changes. This option works great if you can remember the number, but if you can’t, there is not much you can do.

You’ll need to go to the Recent calls list if that’s your case. Look through the list of calls, and when you see the call you want to block, tap on it, and you should see the Block option. You’ll see a confirmation message that’ll ask you if you’re sure that you want to block the number. If you change your mind and want to unlock the person instantly, tap on the Unblock button, it’ll be where the block button used to be.

Blocking Someone Using the Messages App

If the number you want to block recently sent you a message and didn’t call, you can use the messages app to block them. Once you’ve located the message in the app, long-press on it so it’s marked with a checkmark. Tap on the dots at the top right and choose the Block option. If you open the message and tap on the dots at the top right, you won’t see the block option.

How to Unblock Someone on Android

Maybe you didn’t decide to unblock them instantly, but the next day. To take a number off the block list. You’ll need to open the phone app, tap on the dots at the top right and go to Settings. Tap on Blocked Numbers; below, you’ll see the list of the numbers you blocked. You’ll also see an X. Tap on the X, and you’ll see a confirmation message. Once you confirm, the number will be taken off the list.

How to Block Calls on Android Using ESET Mobile Security

Once you have the app open, swipe down to the Call Filter option. Tap on the plus button in the Rules section. Once you’re in New Rule, you’ll need to make a few choices. For example, you’ll need to tell the app what to do with the What dropdown menu. Make sure to choose the Block option. Under the Who option, you’ll see various options of who you can block. Choose who you want to block if it’s a group, but if it’s a specific number, there’s a particular field below.

If you have more than one number to block, tap on the plus sign to add more number fields or the trash icon to erase any. The last option you’ll need to adjust is the When option. You can choose from Always and Custom. In the Custom option, you can select a specific day and time. Don’t forget to save your options when you’re done. Let’s say you decided to block all unknown numbers. You can return at any time and erase a specific number by following the same steps.

You can see how well the app is blocking your calls by looking at the call log at the bottom of the Call Filter option.


How To Block Texts On Android

How many times have you been in a situation where your SMS inbox scenario looks something like this?

5 minutes ago? Right now? ALWAYS? Well, with the explosion of E-Commerce and suites of other online services, it’s not uncommon to find your inbox cluttered with promotional messages from your ISP, your telecom operator and at times those unknown and unwanted spam numbers.

While Android has always been popular in the community for enabling users to customize their devices, the way that they want or in other words “Being Together, Not The Same”, handling situations where it is required to take control over who sends you texts and who doesn’t , has been a little complicated (at least until KitKat arrived), but not impossible. Let’s take a look how:

For Devices Running KitKat/Lollipop

If you fall into the roughly 34% of users with KitKat or Lollipop on your devices, you’re in luck as Google implemented Call and Text blocking natively into the platform. In order to block a number from texting you, follow the steps given below.

Head over to your messaging app.

Select the thread which has the number you want to block.

Tap on the overflow button on the App Bar and then tap on Block and it’s done.

For Pre-KitKat Devices

If you run an older version of Android don’t worry you’re not out of luck just yet. There are a plethora of apps specifically developed to block those unwanted texts and calls. On doing a query you get 100+ Apps which claim to do the job, but for the sake of convenience we will cover 5 with of them with a huge install base and great ratings.

1. TrueCaller

While most of you know TrueCaller comes in handy when you want to find the ID of the unknown number contacting you, TrueCaller also offers SMS Blocking. Once you have put a number on your blacklist, and it will automatically block the texts from them. Or you can even block them by going to the block menu and tapping the floating button on the lower right and selecting ‘From recent SMS’.


NQ Mobile security is popular among Android users for the security services it provides like an App vault, Contacts Backup, Antivirus etc. While the name says “Call Blocker” the app also features SMS blocking. What sets it apart from others is its Custom Blocking Modes where you can set who you actually want to receive calls and texts from and how. The App supports 9 Languages and has an install base of over 1 Million.


3. Go-SMS Pro

While this may certainly not be a dedicated app for SMS Blocking, It does have the ability to do it. Users get features of customizing the app with themes and also privacy features like privacy box to keep their SMS private. Go-SMS is one of the most popular third party SMS App with an install base of over 50 Million.

4. Mr. Number

Apart from offering most of the features expected in a messaging app, this app boasts of its ability to warn other users of the service regarding spam numbers, hence making it a crowd sourced service. The App has been reviewed by reputed tech blogs like PC Mag and even The New York Times.


5. SMS Blocker Clean Inbox


For Those Who Use CyanogenMod /Cyanogen OS

Cyanogen is an aftermarket version of the Android OS which is popular in the tech community for the level of customization it offers. You can make system level modifications be it changing the kernel, changing the font on a per-app basis or even taking control over those annoyingly complicated volume controls (Cough Lollipop!). While the most common way to install Cyanogen is to manually flash it, there are devices which ship with Cyanogen and are gaining some pretty good traction in the market eg. The OnePlus One, the YU lineup of devices.

Head over to the Settings App

Go to Privacy

Select “Blocked Caller Lists”

You can blacklist your contacts or even add a number and block incoming texts or calls or both from them.

SEE ALSO: How To Block Ads In Android Apps And Browser


Best Ways To Organize Apps On Android

Best Ways to Organize Apps on Android

The best thing about Android devices is that it allows you to customize your app drawer and home screen. If your device is cluttered with a lot of apps, you can make use of this feature to organize apps on Android as and how you want them. There are different approaches to it.  Following are the 10 best ways to declutter your Android and easily organize apps:

Also Read: Stay Organized With The Best To-Do List Apps For Android

10 Best Ways to Organize Apps on Android 1. Create Folders and Action Categories

The easiest way to organize apps on Android is by clubbing them together and listing them based on what they do. For instance, merge all your banking and payments apps in one folder and then list them in the order of your usage. Now do the same thing for travel, jobs, news, productivity, learning, play, and other apps.

You can also list them using text labels that emphasize the purposes for which you utilize them. This allows you to quickly access the apps you want to use on the go. This way, you will be able to manage and organize apps easily.

2. Create Shortcuts and Using Widgets

Often underrated, we believe that shortcuts and widgets are one of the best things about Android. To make navigation between apps faster, you can create widgets or shortcuts to frequently used apps on the borders of your home screen. For instance, put an email app on the left side of your screen and a phone app on the right, or wherever else you like. Once you’ve arranged the apps, opening the required app merely requires one tap.

Must Read: Top 8 Free Icon Packs to Customize Your Android Phone

3. Use Color Coding to Manage Android Apps

If you are a visual learner, the best way to organize apps on Android is by color-coding them. We all know that Facebook’s icon is blue while Snapchat has a yellow logo. Hence, we can drag Facebook, Twitter & similar colored-apps at one place and add Snapchat next to Apple Maps or presto! For those of you who relate more to the appearance of an application than to its function, this is a fantastic approach to organize apps on Android.

Must Read: Best Measurement Apps For Android and iPhone

4. Organize Apps Based On The Frequency Of Usage

There are a few apps that every one of us uses on a daily basis. Organizing these apps by frequency is another wonderful option if you want to reduce the amount of time spent in searching for an app. For instance, you can move apps you use every day on the first screen and other apps on the adjacent screen that can be accessed only in one swipe. Similarly, you can swipe again to discover the least favorite apps.

Must Read: 10 Best Screen Brightness Control Apps For Android

5. Sort Them Alphabetically

Believe it or not, categorizing your apps in alphabetical order is the easiest and most effective way to manage Android apps. This approach makes it effortless to locate an app since you can always follow the sequence. Besides this, you can also create a folder and label them alphabetically. You can give your folders names like “A”, “B”, “C” etc., and group all the apps with names that begin with A, B, C and so on into their corresponding folders.

6. Using Easy Drawer – App Organizer

Using a dedicated App Organizer is an excellent way to manage Android apps. They allow you to personalize drawers as and how you need them. One such app is Easy Drawer – App Organizer. It has a modern UI that not only gives a touch of excellence to your app drawer but also helps you launch your favorite app at blazing speed. You can create a folder of your Favorite apps, making the frequently used apps more accessible.

7. Add Extra Home Screens

Over time, we end up cluttering our home screen to fit everything in a single window. This makes it even more difficult to locate and organize the apps. One way to tackle this problem is by adding more home screens on your smartphone.  You can place the apps in different home screens based on how often you use them. Start by pinning your most frequently used apps, such as phone app, email client in one home screen and browser, shopping apps, to the other one.

8. Use Symbols and Emojis for Folder Names

This is a fun way to organize apps on Android in 2023. Using generic names for folders like Games and Music is pretty common. Adding descriptive emoji labels to your folders, or a combination of text and emojis can revamp the overall appearance. For instance, you can add the musical note icon for storing apps like SoundCloud and Spotify.

9. Keep Infrequently Used Apps in a Separate Folder

Every app is useful but a lot of them can only be useful in certain situations. And these are the apps that we rarely use. Their presence sometimes makes it difficult to locate the app you genuinely need. To make it easier for you, create a separate folder and merge the rarely used apps in it. This way, they won’t come in between the other apps frequently.

10. Uninstall the Apps You No Longer Need

There are times when we install certain apps that we later never use. But often keep them as it is which not only clutters your home screen but also takes up unnecessary space on Android. So determine if they’re valuable enough to retain on your phone, or delete them altogether. To reduce needless clutter, you can also delete the pre-installed applications or “bloatware” from your smartphone.

Final Takeaways:

The need for organizing apps spikes when you are running out of time and you need an app to complete a task. The above 10 approaches will help you easily arrange apps on Android, so that you can get your important work done in time.  Learn these different ways to organize Android apps and enhance productivity!

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7 Free Ways To Compress Images On Mac

As cameras and screen resolutions increase, the photos and screenshots you take can run into several MBs. The large file means it occupies more space (on Mac, iCloud, SSD) and takes longer to send via Slack, email, etc. One way to address this is by reducing image file size on Mac.

Compressing and decreasing the photo size certainly lowers the picture quality a bit. But in most cases, you won’t notice much difference. Here are seven quick and free ways to compress photos on Mac one at a time or several in batch/bulk.

Factors on which the image file size depends

The file size of a photo depends on various things like:

Image dimensions: A 1920 x 1080 image will have a bigger file size than a 720 x 480 image.

Image format: For most pictures, JPG/JPEG tends to have a smaller file size than PNG. But if your image is mainly text-based, PNG is better.

Image content and color depth: If there are many black portions in the image instead of white, it can have a smaller file size.

Camera type: Pictures taken by the front iPhone camera or the MacBook’s webcam will almost always have a smaller file size than the primary camera, which runs into several megapixels.

Flash: If you use flash while shooting pictures, this will result in an image with increased file size.

Screen resolution: The screenshot file size of my new retina 13-inch MacBook Pro is far more than that of my non-retina 13-inch MacBook Pro. This is because the sharper screen has more pixels and image dimensions, resulting in bigger screenshots.

Now that you know the basics about image file size, here are some quick ways to convert large images on Mac to smaller sizes.

1. Reduce image file size by changing their format

I take dozens of screenshots on iPhone and Mac every day for my articles. By default, Apple devices take and save screenshots in PNG format.

If the screenshot only has text (like that of the iPhone Settings app), I almost always keep it in PNG format.

But if the image has graphics (like the screenshot of Home Screen with app icons), I convert it to JPG in 99.9% of cases. JPG offers almost the same picture quality as PNG but significantly reduces file size. Sometimes the file size reduction is up to 98%!

In the steps below, you will see how to change the image format. If you already know how to convert images from one format to another, you may also use those methods.

And if you take lots of screenshots, you can use an easy Terminal command to change Mac’s screenshot format to reduce size.

2. Compress file size by resizing image

If you have a huge image of width and height like 4000px and 2800px, it likely runs into several megabytes. To address this, you can resize and reduce the dimensions to something like 2000px into 1400px. This will lower the file size. You can see the image dimensions by selecting it and pressing Command + I. To make the image file size even smaller, compress the resized image.

Here’s how you can use the handy quick actions menu to compress images on Mac running macOS Monterey and later:

3) JPEG format is suitable unless you wish to change it. Checked “Preserve metadata” means you want to keep the photo details like date, time, location, etc. You can uncheck that if desired.

4. Use Preview on Mac to compress pictures

Preview offers the tools to reduce image file size. You can work with one or multiple images and decrease their file size.

Compress one image

Here’s how you can use the Preview app on any macOS version to compress one image:

3) Choose the format. HEIC isn’t compatible everywhere but offers a significantly smaller file size. You may also choose JPEG or others as needed.

4) Drag the quality slider to lower it.

Tip: After compressing the image, if you feel the quality is unusable, follow the same steps with the original image and go easy on the quality slider.

Compress images in bulk/batch

Here’s how you can use the Preview app on any macOS version to compress several images together:

1) Select multiple images in the Finder folder by holding the Command key or pressing Command + A to select all.

3) Press Command + A and make sure all image thumbnails are selected in the left sidebar of the Preview app.

6) Set the format and drag the quality slider to adjust it.

How to fix “Cannot export selected items” in Mac’s Preview app?

5. Compress images using Mac’s Photos app

Like the Preview app, you can reduce image file size using the macOS Photos app. The process is similar, as evident from these steps:

1) Select one or more pictures in the Photos app.

4) Accordingly, set the Photo Kind, Quality, and Size to compress the images.

6. Use photo compression apps

The Mac App Store has several apps that let you compress images. Search for something like “compress images” in the App Store.

On my Mac, I use Compress Photos & Pictures, which is an app for iPhone and iPad developed by iDB. But since I use a MacBook with Apple Silicon, I can install this app on my Mac, and it works as flawlessly as it works on iPhone.

Once you have Compress Photos & Pictures on your Mac, the steps are effortless. You can add photos from the Photos app and save the compressed images back to the Photos app.

7. Use online sites to compress images

Finally, one more method I use daily to compress images for iDB posts is via online services.

One web search for “compress images” will list hundreds of such sites. Two that I like and have been using for many years are:

Feel free to give them a try. But you must know that here, you’re uploading the images to the site’s servers. Since I compress screenshots with non-personal or non-sensitive information, I see no harm in using these. But for compressing images of identity cards, driving licenses, personal photos, etc., I use the offline methods mentioned above.

Check out next:

Queries On Number Of Binary Sub

In this problem, we are given a binary matrix bin[][] of size nXm. Our task is to solve all q queries. For query(x, y), we need to find the number of submatrix of size x*x such that all the elements of array y (binary number).

Problem description

Here, we need to count the total number of sub-matrix of a given size that consists of only one of the two bits i.e. sub-matrix will all elements 0/1.

Let’s take an example to understand the problem, Input n = 3 , m = 4 bin[][] = {{ 1, 1, 0, 1} { 1, 1, 1, 0} { 0, 1, 1, 1}} q = 1 q1 = (2, 1) Output 2 Explanation

All sub-matrix of size 2 with all element 1 are −

{{ 1, 1, 0, 1} { 1, 1, 1, 0} { 0, 1, 1, 1}} {{ 1, 1, 0, 1} { 1, 1, 1, 0} { 0, 1, 1, 1}}

The solution to this problem is using the Dynamic programming approach. To solve, we will maintain a 2D matric DP[][] to store the largest submatrix of the same bit. i.e. DP[i][j] will store the value of sub-matrix whose end index is (i, j), and all the elements are the same.

For your understanding, if DP[4][5] = 2, elements at bin[3][4], bin[3][5], bin[4][4] and bin[4][5] are same.

So, for finding DP[i][j], we have two cases −

Case 1 − if i = 0 orj = 0 : DP[i][j] = 1, as only one sub-matrix can be possible.

Case 2 − otherwise, bin[i-(k-1)][j] = bin[i][j – (k-1)] …: in this casae DP[i][j] = min(DP[i][j-1] , DP[i -1][j], DP[i-1][j-1] ) + 1. This will contribute to the sub-matrix like, we require. Let’s generalise, the case with k = 2, i.e. if we consider a sub-matrix of size 2X2. Then we need to check if bin[i][j] = bin[i] [j – 1] = bin[i- 1][j] = bin[i -1 ][j -1 ], if it is possible then, we will find the DP[i][j] for k =2 .

If the case 2 conditions are not met, we will set DP[i][j] = 1, which can be treated as a default value.

This value of DP[i][j] can be for a set bit or unset bit. We will check the using namespace std; #define N 3 #define M 4

int min(int a, int b, int c) {    if (a <= b && a <= c)    return a;    else if (b <= a && b <= c)    return b;    else    return c; }

int solveQuery(int n, int m, int bin[N][M], int x, int y){    int DP[n][m], max = 1;    for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {          DP[i][j] = 1;          else if ((bin[i][j] == bin[i – 1][j]) && (bin[i][j] == bin[i][j – 1]) && (bin[i][j] == bin[i – 1][j – 1])) {             DP[i][j] = min(DP[i – 1][j], DP[i – 1][j – 1], DP[i][j – 1]) + 1;             if (max < DP[i][j])             max = DP[i][j];          }          else          DP[i][j] = 1;       }    }    int zeroFrequency[n+m] = { 0 }, oneFrequency[n+m] = { 0 };    for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {          if (bin[i][j] == 0)          zeroFrequency[DP[i][j]]++;          else          oneFrequency[DP[i][j]]++;       }    }       zeroFrequency[i] += zeroFrequency[i + 1];       oneFrequency[i] += oneFrequency[i + 1];    }    if (y == 0)    return zeroFrequency[x];    else    return oneFrequency[x]; } int main(){    int n = 3, m = 4;    int mat[N][M] =    {{ 1, 1, 0, 1},    { 1, 1, 1, 0},    { 0, 1, 1, 1}};    int Q = 2;    int query[Q][2] = {{ 2, 1}, { 1, 0}};    for(int i = 0; i < Q; i++){       cout<<“For Query “<<(i+1)<<“: The number of Binary sub-matrices of Given size is ”            <<solveQuery(n, m, mat, query[i][0], query[i][1])<<“n”;    }    return 0; }

Output For Query 1: The number of Binary sub-matrices of Given size is 2 For Query 2: The number of Binary sub-matrices of Given size is 3

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