How about this code :

>
> FOR meetup IN meetups
>   FILTER 'NOSQL' IN meetup.topics
>   FOR city IN OUTBOUND meetup held_in
>     FOR programmer IN INBOUND city lives_in
>
          FILTER *programmer.lang **==  **meetup**.lang * 

>       FILTER programmer.notify
>         INSERT { email: programmer.email, meetup: meetup._key, city: 
> city.name }
>         INTO invitation
>



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