16(9)->10(7,1),13(7,2),6(6,3),2(4,4),14(1,5),
10(7)->1(6,2),18(6,3),5(4,4),19(1,5),
13(7)->3(5,3),11(3,4),8(0,5),
1(6)->9(5,3),4(2,4),15(0,5),
6(6)->7(2,4),
18(6)->17(2,4),
3(5)->20(2,4),
9(5)->12(1,4),
