Task: Program Execution
Input (English): n, 8, 3, 1, 6, l, f
Output (English): [['n', '8', '3', '1', '6', 'l'], ['n', '8', '3', '1', '6', 'f'], ['n', '8', '3', '1', 'l', 'f'], ['n', '8', '3', '6', 'l', 'f'], ['n', '8', '1', '6', 'l', 'f'], ['n', '3', '1', '6', 'l', 'f'], ['8', '3', '1', '6', 'l', 'f']]