Task: Program Execution
Input (English): F, 5, e, x, 7, O
Output (English): [['F', '5', 'e', 'x', '7'], ['F', '5', 'e', 'x', 'O'], ['F', '5', 'e', '7', 'O'], ['F', '5', 'x', '7', 'O'], ['F', 'e', 'x', '7', 'O'], ['5', 'e', 'x', '7', 'O']]