Task: Program Execution
Input (English): I, 7, 4, 1, 7, V, a
Output (English): [['I', '7', '4', '1', '7', 'V'], ['I', '7', '4', '1', '7', 'a'], ['I', '7', '4', '1', 'V', 'a'], ['I', '7', '4', '7', 'V', 'a'], ['I', '7', '1', '7', 'V', 'a'], ['I', '4', '1', '7', 'V', 'a'], ['7', '4', '1', '7', 'V', 'a']]