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