Megan has 34 rocks in her rock collection. she wants to put 5 rocks in some cases and 7 rocks in other cases. how could she arrange the rocks?

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.