[rules-users] Iterating two collection in LHS

[techy]

Hello,

Please help me to implement following rule in drool. I could not find a way
to iterate two collection using accumulate or collect in LHS.

public Male{
  int age;
  //other fields

}

public Female{
  int age;
  //other fields

}
public City{

 private List<Male>  maleList;
 private List<Female> femaleList;
 
}

#Rule to get all Male whose age != any of female's
rule "Get Unlucky Male"
when
	city : City()
        maleList : ArrayList() from collect ( Male( his age = any of
Female's age  from city.femaleList  ) from city.maleList)
//consequence
end
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