# This is a "very hard" instance
# From https://www.puzzlesandbrains.com/puzzleview.php?id=391&pstid=604
# (problem 2)
- - 28 - 25 23
- - - - - -
- - 32 - - 1
- 9 - - - -
- 11 - - 18 -
36 - - 13 - 17
