Task: Program Execution
Input (English): F, 6, N, x, B
Output (English): [['F', '6', 'N', 'x'], ['F', '6', 'N', 'B'], ['F', '6', 'x', 'B'], ['F', 'N', 'x', 'B'], ['6', 'N', 'x', 'B']]