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Converting NSArray to NSMutableArray to allow modification

suggest change 
NSArray *myColors = [NSArray arrayWithObjects: @"Red", @"Green", @"Blue", @"Yellow", nil];

// Convert myColors to mutable
NSMutableArray *myColorsMutable = [myColors mutableCopy];
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NSArray:
* NSArray
* Creating Arrays
* Accessing elements
* Reverse an Array
* Converting NSArray to NSMutableArray to allow modification
* Converting between Sets and Arrays
* Using Generics
* Comparing arrays
* Sorting Arrays
* Filtering Arrays With Predicates
* Enumerating using blocks
* Looping through
* Sorting array with custom objects
* Move object to another index
* Deleting Elements
* Insert Elements
* Adding elements
* Finding out the Number of Elements in an Array
* Add objects to NSArray
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