Merge two lists of length 6 into a single list.
Input: List 1: 1, 3, 5, 7, 9, 11
List 2: 2, 4, 6, 8, 10, 12
The merged list is [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12].
The merged, single list is [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12].