With the array-based implementation of the bag, how is the gap left when an item is removed handled? 

1,The remove method was not implemented due to the difficult nature of the task. 

2.The gap is filled with the last item in the array. 

3.All items after the gap are moved up by one position.

 4.The index of the gap is kept up with a free list to be used by the add method to fill the gaps.

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