Task: Program Execution
Input (English): 3, n, f, 7, n, 5, 1
Output (English): [['3', 'n', 'f', '7', 'n', '5'], ['3', 'n', 'f', '7', 'n', '1'], ['3', 'n', 'f', '7', '5', '1'], ['3', 'n', 'f', 'n', '5', '1'], ['3', 'n', '7', 'n', '5', '1'], ['3', 'f', '7', 'n', '5', '1'], ['n', 'f', '7', 'n', '5', '1']]