Task: Program Execution
Input (English): 8, 6, E, 7, N, 9, 7
Output (English): [['8', '6', 'E', '7', 'N', '9'], ['8', '6', 'E', '7', 'N', '7'], ['8', '6', 'E', '7', '9', '7'], ['8', '6', 'E', 'N', '9', '7'], ['8', '6', '7', 'N', '9', '7'], ['8', 'E', '7', 'N', '9', '7'], ['6', 'E', '7', 'N', '9', '7']]