Task: Program Execution
Input (English): g, w, q, r, B
Output (English): [['g', 'w', 'q', 'r'], ['g', 'w', 'q', 'B'], ['g', 'w', 'r', 'B'], ['g', 'q', 'r', 'B'], ['w', 'q', 'r', 'B']]