title: How to write Drools rule to validate several values in an array or list
body: <p>I have an array with a Collection or an array of values.
  I want to write a rule of this form:</p>
  
  <pre><code>rule "listRule"
  
  when 
  $first: from list1() and $first!= "a" and $first!="b"
  $second: from list1() and $second!="c" and $second != "z"
  then
  System.out.println(" this works!")
  
  end
  </code></pre>
  
  <p>The objective is to be able to evaluate if a list or an array has 2 or more objects($first, $second and so on) that each satisfy a different condition of theirs. It can be an array or list.</p>