Task: Program Execution
Input (English): r, W, 7, 1, 7, 8, O
Output (English): [['r', 'W', '7', '1', '7', '8'], ['r', 'W', '7', '1', '7', 'O'], ['r', 'W', '7', '1', '8', 'O'], ['r', 'W', '7', '7', '8', 'O'], ['r', 'W', '1', '7', '8', 'O'], ['r', '7', '1', '7', '8', 'O'], ['W', '7', '1', '7', '8', 'O']]