Task: Program Execution
Input (English): e, v, e, k, b
Output (English): [['e', 'v', 'e', 'k'], ['e', 'v', 'e', 'b'], ['e', 'v', 'k', 'b'], ['e', 'e', 'k', 'b'], ['v', 'e', 'k', 'b']]