title: Finding hamming distance of code
body: <p>A question asks: find the hamming distance of the following code:  </p>
  
  <pre><code>11111  
  10101  
  01010  
  11100  
  00011  
  11001
  </code></pre>
  
  <p>The answer is 2. How does this work? I thought hamming distance is only between two strings?</p>