Task: Program Execution
Input (English): 6, K, 7, D, u
Output (English): [['6', 'K', '7', 'D'], ['6', 'K', '7', 'u'], ['6', 'K', 'D', 'u'], ['6', '7', 'D', 'u'], ['K', '7', 'D', 'u']]