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