Task: Program Execution
Input (English): 8, R, z, x, 4
Output (English): [['8', 'R', 'z', 'x'], ['8', 'R', 'z', '4'], ['8', 'R', 'x', '4'], ['8', 'z', 'x', '4'], ['R', 'z', 'x', '4']]