title: Elegant way to make a column of multiple factors in dplyr via mutate
body: <p>Given the following</p>
  
  <pre><code>group
  0
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10
  </code></pre>
  
  <p>What is an elegant way to create a new column <code>level</code> to make data look like the following</p>
  
  <pre><code>group  level
  0       none
  1       low
  2       low
  3       low
  4       med
  5       med
  6       med
  7       high
  8       high
  9       high
  10      very_high
  </code></pre>
  
  <p>my current solution is to input each of the values in <code>mutate</code>. Is there a better way? </p>