Quarta consegna

In a "generic model face based" file I created a "child file" with the element which will be repeat to create the composition. 
First, I created an rectangular shape extrusion, then with the tool "void" I did two cylinders to create two holes in the shape.
After, I created a second "generic model face based" for the mother file. Inside I did the support and the cylinders  on which the "children" elements are threaded.