Task: Program Execution
Input (English): a, 1, N, s, 7, k
Output (English): [['a', '1', 'N', 's', '7'], ['a', '1', 'N', 's', 'k'], ['a', '1', 'N', '7', 'k'], ['a', '1', 's', '7', 'k'], ['a', 'N', 's', '7', 'k'], ['1', 'N', 's', '7', 'k']]