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