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