Task: Program Execution
Input (English): 2, E, 8, 1, 7, k, 4
Output (English): [['2', 'E', '8', '1', '7', 'k'], ['2', 'E', '8', '1', '7', '4'], ['2', 'E', '8', '1', 'k', '4'], ['2', 'E', '8', '7', 'k', '4'], ['2', 'E', '1', '7', 'k', '4'], ['2', '8', '1', '7', 'k', '4'], ['E', '8', '1', '7', 'k', '4']]