I found this on the ground. Did you drop it?<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chomsky_hierarchy#The_hierarchy" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chomsky_hierarchy#The_hierarch...</a>