F n 4 f n 2

F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2
F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2
F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2F n 4 f n 2