2-2.5 6 5 6 1-2 1-2 1-2 2-3 2-3 2-3 2-3 2-3 2-3 4 . . 0.5-1 1-2 1-2 1-2 1-2 1-2 2 2 2 2 3 4 5 2 3 3 4 2 3 4 5 1