Would this work :

FOR meetup IN meetups
  FILTER 'NOSQL' IN meetup.topics
  FOR city IN OUTBOUND meetup held_in
    FOR programmer IN INBOUND city lives_in
      FILTER *meetup**.lang == programmer.lang*
      FILTER programmer.notify
       INSERT { email: programmer.email, meetup: meetup._key, city: 
city.name }        
       INTO invitations

 

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