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