Objective-C - How to add objects in 2d NSMutableArrays?

You're using the same NSMutableArray for both sub-arrays. You need to use two different objects. Specifically, instead of.

You're only actually creating two arrays here. You're creating the "outside" array, and then adding two references to the same inner array to it. When you output it, you're seeing those two inner arrays referencing exactly the same thing.

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