% hitori 504 by Otto Janko, http://www.janko.at/Raetsel/Hitori/504.a.htm
hitori
medium-
10 10
42388966a2
9a52124635
677a481924
5937873236
3a965a5812
724962a751
a381967989
2165359978
a183627469
7885215343
