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