Task: Program Execution
Input (English): O, 8, C, o, M, m
Output (English): [['O', '8', 'C', 'o', 'M'], ['O', '8', 'C', 'o', 'm'], ['O', '8', 'C', 'M', 'm'], ['O', '8', 'o', 'M', 'm'], ['O', 'C', 'o', 'M', 'm'], ['8', 'C', 'o', 'M', 'm']]