Task: Program Execution
Input (English): f, 9, a, 7, 8, 5
Output (English): [['f', '9', 'a', '7', '8'], ['f', '9', 'a', '7', '5'], ['f', '9', 'a', '8', '5'], ['f', '9', '7', '8', '5'], ['f', 'a', '7', '8', '5'], ['9', 'a', '7', '8', '5']]