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