Task: Program Execution
Input (English): p, I, 9, r, N, 7, B
Output (English): [['p', 'I', '9', 'r', 'N', '7'], ['p', 'I', '9', 'r', 'N', 'B'], ['p', 'I', '9', 'r', '7', 'B'], ['p', 'I', '9', 'N', '7', 'B'], ['p', 'I', 'r', 'N', '7', 'B'], ['p', '9', 'r', 'N', '7', 'B'], ['I', '9', 'r', 'N', '7', 'B']]