Task: Program Execution
Input (English): F, R, 1, d, 5, 6
Output (English): [['F', 'R', '1', 'd', '5'], ['F', 'R', '1', 'd', '6'], ['F', 'R', '1', '5', '6'], ['F', 'R', 'd', '5', '6'], ['F', '1', 'd', '5', '6'], ['R', '1', 'd', '5', '6']]