I confess that the last time I cracked open a Prolog book was lo these many 
years ago in college and that I need to re-read The Art but I'm hoping that 
someone can point out how I'm thinking about this problem wrongly:
I'd like to write a goal that succeeds when given a set of required items 
and a set of supplied items, the supplied items is a proper superset of the 
required items.  My intuition is that I want a goal that succeeds and 
'returns' the common subset of the two sets and then another goal that 
tries to unify the subset with the required items:

> (defn satisfes-requirements-o [required given]
>   (let [subset (run* [q]
>                      (membero q required)
>                      (membero q given))]
>     (== subset required)))
>

I'm basically treating the subset operation as a subrouting and using run*  
to aggregate the common elements.  This feels wrong and it feels like I 
should use something less procedural but I can't wrap my brain around how 
else to approach the problem.  Suggestions?  Hints?

Thanks

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