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