Task: Program Execution
Input (English): C, U, 6, U, F, q, 3
Output (English): [['C', 'U', '6', 'U', 'F', 'q'], ['C', 'U', '6', 'U', 'F', '3'], ['C', 'U', '6', 'U', 'q', '3'], ['C', 'U', '6', 'F', 'q', '3'], ['C', 'U', 'U', 'F', 'q', '3'], ['C', '6', 'U', 'F', 'q', '3'], ['U', '6', 'U', 'F', 'q', '3']]