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