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