!! Be careful, hachure is a concept which is rather aimed at the fans of complexity and technical reflection !!

I don't know about you, but as far as I'm concerned, I think this one is perfect to put a swing in it.
May contain traces of trees.

Difficulty : ***

Tested, logical.
Bound-logic can be useful.
The first hachure where I introduce bound-logic is the number 46. Number 56 comes with a tutorial in the comments section. This logic require a condition, which is verified here.
Good blackenage.