Task: Program Execution
Input (English): 2, 8, O, 7, O, y, D
Output (English): [['2', '8', 'O', '7', 'O', 'y'], ['2', '8', 'O', '7', 'O', 'D'], ['2', '8', 'O', '7', 'y', 'D'], ['2', '8', 'O', 'O', 'y', 'D'], ['2', '8', '7', 'O', 'y', 'D'], ['2', 'O', '7', 'O', 'y', 'D'], ['8', 'O', '7', 'O', 'y', 'D']]