Task: Program Execution
Input (English): K, s, 8, 4, O, T
Output (English): [['K', 's', '8', '4', 'O'], ['K', 's', '8', '4', 'T'], ['K', 's', '8', 'O', 'T'], ['K', 's', '4', 'O', 'T'], ['K', '8', '4', 'O', 'T'], ['s', '8', '4', 'O', 'T']]