Task: Program Execution
Input (English): 7, a, 6, G, T
Output (English): [['7', 'a', '6', 'G'], ['7', 'a', '6', 'T'], ['7', 'a', 'G', 'T'], ['7', '6', 'G', 'T'], ['a', '6', 'G', 'T']]