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