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