title: Need a map but only need to know if contained?
body: <p>I'm wondering if there is a more appropriate structure for my needs.</p>
  
  <p>I need to have a dictionary or strings (words). All I need to know is if a given word is in the dictionary.</p>
  
  <p>It seems like a waste of memory to make a map of string,string. Is there a better way?</p>
  
  <p>Thanks</p>