Task: Program Execution
Input (English): 7, W, O, 4, F
Output (English): [['7', 'W', 'O', '4'], ['7', 'W', 'O', 'F'], ['7', 'W', '4', 'F'], ['7', 'O', '4', 'F'], ['W', 'O', '4', 'F']]