title: How do I get the set of all letters in Java/Clojure?
body: <p>In Python, I can do this:</p>
  
  <pre><code>&gt;&gt;&gt; import string
  &gt;&gt;&gt; string.letters
  'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
  </code></pre>
  
  <p>Is there any way to do something similar in Clojure (apart from copying and pasting the above characters somewhere)?  I looked through both the Clojure standard library and the java standard library and couldn't find it.</p>