title: How to delete every other line in Vim?
body: <p>I would like to delete every other line from a Vim buffer, starting with the second one, i.e., lines 2, 4, 6, etc. For example, if the buffer’s contents is:</p>
  <pre><code>aaa
  bbb
  ccc
  ddd
  eee
  fff
  </code></pre>
  <p>then, after the desired line removal, it should become:</p>
  <pre><code>aaa
  ccc
  eee
  </code></pre>
  <p>Which Vim commands can be used to automate this operation?</p>