title: Nested libraries aar file behavior
body: <p>We are facing problem while importing the aar file of a library (let's call it <code>library_2</code>) into another library (let's call it <code>library_1</code>). In addition, we need to import in the app project only library_1.aar file and make library_2 methods available at project level. What would it be the folders structure and the corresponding .gradle files? </p>
  
  <p>Description of the problem in the image below:
  <img src="https://i.stack.imgur.com/SKpCw.jpg" alt="enter image description here"></p>