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How to retrieve all connected data entities from all connectin entities in one query?

I'm refering this to one of the exercises from "Edge Developer bootcamp".

Scenario is something like this,

I have created two collections,

POST /libraries
POST /books

And then added some entities to both. Later, created few connections on libraries.

POST /libraries/Lib1/has/books/test
POST /libraries/Lib2/has/books/<some-name>

Now, I want to retrieve a list of books contained in all libraries that are within a specified number of meters from a location. Assume, I have added location data to libraries entity.

Can you please help me with the query ?

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