Task: Program Execution
Input (English): 4, x, 4, 9, e, m
Output (English): [['4', 'x', '4', '9', 'e'], ['4', 'x', '4', '9', 'm'], ['4', 'x', '4', 'e', 'm'], ['4', 'x', '9', 'e', 'm'], ['4', '4', '9', 'e', 'm'], ['x', '4', '9', 'e', 'm']]