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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