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