title: I have three radio buttons in one cell in tablesorter
body: <p>I have three radio buttons in one cell in tablesorter.
  How can I filter by each value?
  I have been trying for several days looking at the official site but cannot solve the problem.</p>
  <p><a href="https://i.stack.imgur.com/peen8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/peen8.jpg" alt="enter image description here" /></a></p>