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