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