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