Task: Program Execution
Input (English): m, 1, N, 6, M, 7
Output (English): [['m', '1', 'N', '6', 'M'], ['m', '1', 'N', '6', '7'], ['m', '1', 'N', 'M', '7'], ['m', '1', '6', 'M', '7'], ['m', 'N', '6', 'M', '7'], ['1', 'N', '6', 'M', '7']]