Task: Program Execution
Input (English): S, 1, i, S, 6, X, M
Output (English): [['S', '1', 'i', 'S', '6', 'X'], ['S', '1', 'i', 'S', '6', 'M'], ['S', '1', 'i', 'S', 'X', 'M'], ['S', '1', 'i', '6', 'X', 'M'], ['S', '1', 'S', '6', 'X', 'M'], ['S', 'i', 'S', '6', 'X', 'M'], ['1', 'i', 'S', '6', 'X', 'M']]