Task: Program Execution
Input (English): y, f, 2, 1, 6, 6
Output (English): [['y', 'f', '2', '1', '6'], ['y', 'f', '2', '1', '6'], ['y', 'f', '2', '6', '6'], ['y', 'f', '1', '6', '6'], ['y', '2', '1', '6', '6'], ['f', '2', '1', '6', '6']]