Task: Program Execution
Input (English): F, b, 1, 6, E, 6
Output (English): [['F', 'b', '1', '6', 'E'], ['F', 'b', '1', '6', '6'], ['F', 'b', '1', 'E', '6'], ['F', 'b', '6', 'E', '6'], ['F', '1', '6', 'E', '6'], ['b', '1', '6', 'E', '6']]