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