title: unique permalink for multiple category
body: <p>How to make unique permalinks even if the post included in multiple category ?</p>
  
  <pre><code>Custom Structure /%category%/%postname%
  </code></pre>
  
  <p>multiple permalinks for same article effecting the facebook like count</p>
  
  <p>presently seems to be like this, how can make this only for one ? 
  <img src="https://i.stack.imgur.com/6TS4O.jpg" alt="enter image description here"></p>