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