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