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