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