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