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