Task: Program Execution
Input (English): 8, U, 0, N, 8, r
Output (English): [['8', 'U', '0', 'N', '8'], ['8', 'U', '0', 'N', 'r'], ['8', 'U', '0', '8', 'r'], ['8', 'U', 'N', '8', 'r'], ['8', '0', 'N', '8', 'r'], ['U', '0', 'N', '8', 'r']]