Task: Program Execution
Input (English): 8, 6, 7, 5, 6, D, x
Output (English): [['8', '6', '7', '5', '6', 'D'], ['8', '6', '7', '5', '6', 'x'], ['8', '6', '7', '5', 'D', 'x'], ['8', '6', '7', '6', 'D', 'x'], ['8', '6', '5', '6', 'D', 'x'], ['8', '7', '5', '6', 'D', 'x'], ['6', '7', '5', '6', 'D', 'x']]