Within Rules, we can choose between these below options:

• all these conditions (AND)
  E.g. "c1" AND "c2" AND "c3"
• any of these conditions (OR)
  E.g. "c1" OR "c2" OR "c3"
• none of these conditions (NOT)
  E.g. NOT ("c1" OR "co2" OR "c3")
         (NOT "c1") AND (NOT "c2") AND (NOT "c3")
  In some case, we may faced more complex condition like:     
  
• "c1" AND ("c2" OR "c3")

• "c1" OR ("c2" AND "c3")
  I know we can achieve this behavior by define multiple rules but it's convenient to have a way to define those conditions in the same the rule builder cause our actions for those rules will be the same (avoid duplicate). So we don't have to update multiple rules when we want to update the actions by the way.

Thanks.