19
1 2,5,7,9,10,
2 2,5,7,8,9,10,
3 4,9,10,11,15,
4 5,6,7,8,9,10,12,13,16,
5 1,3,4,9,18,
6 2,4,9,10,
7 4,9,10,11,15,
8 5,6,7,8,9,17,
9 5,6,7,8,9,10,11,13,14,15,17,
10 1,3,5,7,8,18,
11 1,5,6,7,8,9,11,13,15,17,18,
12 5,6,7,8,9,13,16,17,
13 5,6,7,8,9,10,12,13,16,
14 5,6,7,8,9,10,13,16,
15 1,2,5,6,7,9,10,14,
16 5,6,7,8,9,10,11,13,14,15,17,
17 1,3,5,6,7,8,9,10,13,14,16,18,
18 5,6,7,8,9,10,12,13,16,
19 1,3,5,6,7,8,9,10,13,14,17,18,