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