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