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