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