title: How do I create all unique pairwise combinations of my sample dataset
body: <p>I have a list of 388 sample codes and I want all unique pairwise combinations.
  I've tried several options in r but it still doesn't give me what I want.</p>
  
  <p>This is a part of my sample codes:</p>
  
  <pre><code>11_07LENABL017
  
  30_08ASBBAL033
  
  21_08GEHOAL038
  
  21_08GEHOAL041
  
  04_08HLNABL043
  
  31_08MMBBAL029
  
  39_08VOVOAL030
  
  39_08VOVOAL031
  
  39_08VOVOAL039
  
  
  So what is want is like this:
  
  11_07LENABL017_30_08ASBBAL033
  
  11_07LENABL017_21_08GEHOAL038
  
  11_07LENABL017_21_08GEHOAL041
  </code></pre>
  
  <p>and so on</p>
  
  <p>Any ideas?</p>