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