% slitherlink 571 by Otto Janko, http://www.janko.at/Raetsel/Slitherlink/571.a.htm
slitherlink
easy+
10 10
.3..21..3.
12.3..3.30
..........
.3..20..1.
1..3..3..0
3..3..0..2
.3..03..2.
..........
30.3..0.31
.2..21..2.
