The inner circle is very strongly connected Qoh 5:17-6:02

This image shows a series of connections surrounding 5:19 (Eccl 5:20) and defining it as a centre of at least one circle. Good is connected to its opposite. All others are like to like connections.

The remaining greater circles are more tenuous than this pair. And they are connected as tenuously with other things as well. So while one may see this larger structure, it seems less obvious than I would expect without running too high a risk of imposing on the text. Click on the image below for the full diagram.  You can see that there are some connections I chose not to make, as well as connections that I made which are synonyms or antonyms.