Task: Program Execution
Input (English): x, L, 7, R, C, 9
Output (English): [['x', 'L', '7', 'R', 'C'], ['x', 'L', '7', 'R', '9'], ['x', 'L', '7', 'C', '9'], ['x', 'L', 'R', 'C', '9'], ['x', '7', 'R', 'C', '9'], ['L', '7', 'R', 'C', '9']]