% hitori 306 by Otto Janko, http://www.janko.at/Raetsel/Hitori/306.a.htm
hitori
medium-
10 10
2415a87374
5923578715
61954238a1
a3317a8776
3768944151
769491a925
9736531a87
1572646663
4454367195
487a682639
