Task: Program Execution
Input (English): 1, 2, 4, 9, 6, O
Output (English): [['1', '2', '4', '9', '6'], ['1', '2', '4', '9', 'O'], ['1', '2', '4', '6', 'O'], ['1', '2', '9', '6', 'O'], ['1', '4', '9', '6', 'O'], ['2', '4', '9', '6', 'O']]