Task: Program Execution
Input (English): 8, U, 4, e, B, 6, b
Output (English): [['8', 'U', '4', 'e', 'B', '6'], ['8', 'U', '4', 'e', 'B', 'b'], ['8', 'U', '4', 'e', '6', 'b'], ['8', 'U', '4', 'B', '6', 'b'], ['8', 'U', 'e', 'B', '6', 'b'], ['8', '4', 'e', 'B', '6', 'b'], ['U', '4', 'e', 'B', '6', 'b']]