Thanks to Aad van de Wetering
from Driebruggen for the beautiful photo and for the problem.
Build 3 bridges with a set pentominoes.
Use 4 pentominoes for each bridge.
Each included area must be a rectangle.
The pentominoes must touch along the full edge of the square and not just at the corners.
Search the solution with the most squares.
Do you have our exel-file to draw the pentominoesbridges