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