Task: Program Execution
Input (English): D, 8, 2, 1, k, x
Output (English): [['D', '8', '2', '1', 'k'], ['D', '8', '2', '1', 'x'], ['D', '8', '2', 'k', 'x'], ['D', '8', '1', 'k', 'x'], ['D', '2', '1', 'k', 'x'], ['8', '2', '1', 'k', 'x']]