% hashiwokakero 6 by Toshio Karino, http://www.janko.at/Raetsel/Hashi/006.a.htm
hashiwokakero
medium-
15 15
.1..2...2....3.
2.....3....2..1
..2.2....3..2..
..........2....
4.3..4.2.....3.
..........4.4..
.3..2....2.....
..1....3....2..
.....2....4..2.
..4.4..........
.2.....3.2..3.4
....1..........
..3..4....6.2..
3..2....1.....1
.1....3...4..1.
