title: How to find the numbers in a list that come in numerical order in Python3?
body: <p>I have a list, like this:</p>
  
  <pre><code>list_1 = [1,2,2,3,1,2]
  </code></pre>
  
  <p>I want to create another nested lists like this:</p>
  
  <pre><code>[[1,2,2,1,2],[2,2,3,2]]
  </code></pre>
  
  <p>The first nested list is only composed of 1 and 2 because, according to the numerical order, 2 comes after 1 and 1 is must be included. 3 is not in the first nested list because after 1 comes 2 and not 3.</p>
  
  <p>In the second nested list, there is 2 and 3 because 3 comes after 2 and 2 needs to be included. 1 is not there because one doesn't come after 2.</p>
  
  <p>How can I achieve this in Python 3?</p>