Task: Program Execution
Input (English): 8, p, 4, 6, r, 8
Output (English): [['8', 'p', '4', '6', 'r'], ['8', 'p', '4', '6', '8'], ['8', 'p', '4', 'r', '8'], ['8', 'p', '6', 'r', '8'], ['8', '4', '6', 'r', '8'], ['p', '4', '6', 'r', '8']]