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