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