Task: Program Execution
Input (English): E, 5, e, k, 5, 4
Output (English): [['E', '5', 'e', 'k', '5'], ['E', '5', 'e', 'k', '4'], ['E', '5', 'e', '5', '4'], ['E', '5', 'k', '5', '4'], ['E', 'e', 'k', '5', '4'], ['5', 'e', 'k', '5', '4']]