title: How to display a list vertically?
body: <p>I have a list of letters and want to be able to display them vertically like so:</p>
  
  <pre><code>a d
  b e
  c f
  
  def main():
      letters = ["a", "b", "c", "d","e", "f"]
      for i in letters:
         print(i)
  </code></pre>
  
  <p>this code only display them like this:</p>
  
  <pre><code>a
  b
  c
  d
  e
  </code></pre>