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