Nonograms - Trefoil Knot

I get back from vacation and what's the first thing I encounter? This challenging puzzle! Oh by the way, according to the comments this is apparently a knot commonly associated with the Girl Scouts. So I guess that's more information for my barely-educated mind.

Title: Trefoil Knot
Author: mindscrub
Size: 23x21
Difficulty rating: 2.5/5