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