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