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

Holy smoke! It doesn't seem to be easy...

Difficulty : *****

Tested, logical.
Bound-condition is verified.
Bound-logic and wave-logic can help. It can be useful to clog up some rows where segments can start or end. Furthermore, be attentive to the rows which will be full at a moment.
Good blackenage.