20
13 11 14 16 20 12 18 17 15 19 
17 18 14 12 11 20 13 16 19 15 
19 18 17 14 20 11 16 12 13 15 
15 11 20 19 14 12 13 16 17 18 
16 15 18 19 14 20 11 13 17 12 
14 12 13 18 15 17 19 16 20 11 
19 11 14 12 16 13 17 15 18 20 
14 12 18 11 15 17 13 19 16 20 
13 14 19 17 15 20 16 12 11 18 
20 14 11 13 18 16 17 19 12 15 
9 2 1 4 10 5 6 3 7 8 
9 1 7 6 3 8 10 5 4 2 
4 3 2 9 5 1 8 10 6 7 
1 4 3 2 5 8 9 10 7 6 
1 6 2 4 7 10 9 8 5 3 
8 5 9 3 10 2 4 6 1 7 
3 2 6 5 1 8 7 9 4 10 
5 8 7 10 1 3 9 2 6 4 
1 5 8 3 6 4 2 10 7 9 
1 10 5 2 9 7 6 3 8 4 
forbidden 1 11
forbidden 1 14
forbidden 1 15
forbidden 2 13
forbidden 2 14
forbidden 2 16
forbidden 2 18
forbidden 2 19
forbidden 2 20
forbidden 3 12
forbidden 3 13
forbidden 3 14
forbidden 3 18
forbidden 3 20
forbidden 4 13
forbidden 4 19
forbidden 5 11
forbidden 5 13
forbidden 5 15
forbidden 6 11
forbidden 6 15
forbidden 6 20
forbidden 7 11
forbidden 7 16
forbidden 7 18
forbidden 7 19
forbidden 8 11
forbidden 8 15
forbidden 8 16
forbidden 8 18
forbidden 9 13
forbidden 9 15
forbidden 9 20
forbidden 10 16