#schwer4.txt
s 8 1 2
s 1 1 4
s 2 1 8
s 9 2 4
s 5 2 8
s 9 3 1
s 7 3 2
s 2 3 3
s 6 3 8
s 4 4 1
s 2 4 5
s 6 4 6
s 5 5 5
s 7 5 7
s 8 6 1
s 1 6 3
s 6 7 4
s 9 7 5
s 5 7 6
s 2 8 2
s 5 8 3
s 9 8 9
s 4 9 5
s 1 9 9