Task: Program Execution
Input (English): 9, 0, y, 1, 9, 6, 1
Output (English): [['9', '0', 'y', '1', '9', '6'], ['9', '0', 'y', '1', '9', '1'], ['9', '0', 'y', '1', '6', '1'], ['9', '0', 'y', '9', '6', '1'], ['9', '0', '1', '9', '6', '1'], ['9', 'y', '1', '9', '6', '1'], ['0', 'y', '1', '9', '6', '1']]