I have a graph model that looks like this:

User vertex ---------- member_of edge ----------> Group vertex
Group vertex ---------- member_of edge ----------> Group vertex
Group vertex ---------- permissions edge ----------> Document vertex

So... Users and Groups can be members of Groups, and Groups can have 
permissions over documents. I'm trying to write a query that will tell me 
every User that does not have a path to a Document.

Is there an efficient want to do queries like this in OSQL? Any tips on 
getting started writing this query? 

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