4-6 3 10-11 3-4 1 2 1 1-2 1-2 1 2-3 4-5 3 5-6  1-2 1   2 2 5-6 2-3 1 1 2 3 1-2 2 1-2 1-4 6-8 7-8 1 1 1 1-2 3-4 1 6-7 2-3 1-2 2-3 1-2 4-6 1 4 2 1-2 4-5 4 1-2 10-11 4-7 1-2 2-3 2 8-10 1-2 2 16 18 1 4-6 6-7 2-4 15 1 3 2 