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