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You have a list and another list that contains a few elements. You want to insert all elements from the second list into the first,

You have a list and another list that contains a few elements. You want to insert all elements from the second list into the first, but only at even indices. Which method or combination of methods would be most efficient?
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Use addAll(Collection c) and then rearrange the list to place the new elements at even indices.
Use a loop, and for each iteration, use add(int index, E element) with even indices.
Use addAll(int index, Collection c) at even indices.
Use add(E e) in a loop to insert at the end and then set(int index, E element) to move to the correct position.

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