Users can search for the same thing in different ways. For example, a/b-test OR ab-best OR ab test.
We want to add these variations to the article but so it's not visible on the page.
Why adding them via tags doesn't work:
  1. defies the purpose of the tags; that's not how they are supposed to be used for organizing,
  2. looks bad because tags are there - on the page. So adding "a/b-test ab-best ab test" would look like something technical is popping up, not the content that user actually needs from the article