title: Words combinations without repetition
body: <p>I have 10 words. How can I get all possible combinations of 5 words <code>(n=10, k=5)</code>. The order <strong>does not matter</strong>. </p>
  
  <p>For example: <code>"A", "B", "C", if k=2 (n=3 in this case)</code>, it would like AB, BC and AC. Maybe you know some usefull code or example. </p>
  
  <p>P.S. Sorry if I'm not right enough cause I don't know English very good.</p>