Task: Program Execution
Input (English): 7, 8, u, 9, n, 5
Output (English): [['7', '8', 'u', '9', 'n'], ['7', '8', 'u', '9', '5'], ['7', '8', 'u', 'n', '5'], ['7', '8', '9', 'n', '5'], ['7', 'u', '9', 'n', '5'], ['8', 'u', '9', 'n', '5']]