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