Task: Program Execution
Input (English): s, 5, 7, 7, U, 4
Output (English): [['s', '5', '7', '7', 'U'], ['s', '5', '7', '7', '4'], ['s', '5', '7', 'U', '4'], ['s', '5', '7', 'U', '4'], ['s', '7', '7', 'U', '4'], ['5', '7', '7', 'U', '4']]