Task: Program Execution
Input (English): k, 7, 4, 2, 6, Y, a
Output (English): [['k', '7', '4', '2', '6', 'Y'], ['k', '7', '4', '2', '6', 'a'], ['k', '7', '4', '2', 'Y', 'a'], ['k', '7', '4', '6', 'Y', 'a'], ['k', '7', '2', '6', 'Y', 'a'], ['k', '4', '2', '6', 'Y', 'a'], ['7', '4', '2', '6', 'Y', 'a']]