Task: Program Execution
Input (English): C, O, 5, F, 5, T, S
Output (English): [['C', 'O', '5', 'F', '5', 'T'], ['C', 'O', '5', 'F', '5', 'S'], ['C', 'O', '5', 'F', 'T', 'S'], ['C', 'O', '5', '5', 'T', 'S'], ['C', 'O', 'F', '5', 'T', 'S'], ['C', '5', 'F', '5', 'T', 'S'], ['O', '5', 'F', '5', 'T', 'S']]