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