Task: Program Execution
Input (English): 6, 1, 2, 8, N, 9
Output (English): [['6', '1', '2', '8', 'N'], ['6', '1', '2', '8', '9'], ['6', '1', '2', 'N', '9'], ['6', '1', '8', 'N', '9'], ['6', '2', '8', 'N', '9'], ['1', '2', '8', 'N', '9']]