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