Task: Program Execution
Input (English): q, f, 4, 1, D, i
Output (English): [['q', 'f', '4', '1', 'D'], ['q', 'f', '4', '1', 'i'], ['q', 'f', '4', 'D', 'i'], ['q', 'f', '1', 'D', 'i'], ['q', '4', '1', 'D', 'i'], ['f', '4', '1', 'D', 'i']]