Task: Program Execution
Input (English): a, b, q, 6, y, 7, 6
Output (English): [['a', 'b', 'q', '6', 'y', '7'], ['a', 'b', 'q', '6', 'y', '6'], ['a', 'b', 'q', '6', '7', '6'], ['a', 'b', 'q', 'y', '7', '6'], ['a', 'b', '6', 'y', '7', '6'], ['a', 'q', '6', 'y', '7', '6'], ['b', 'q', '6', 'y', '7', '6']]