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