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