Task: Program Execution
Input (English): m, i, y, a, M
Output (English): [['m', 'i', 'y', 'a'], ['m', 'i', 'y', 'M'], ['m', 'i', 'a', 'M'], ['m', 'y', 'a', 'M'], ['i', 'y', 'a', 'M']]