Greetings,
you might try making the keys of your hash the query, or perhaps a hash of references to your data with the query as the key, that way you can't have duplicates (like an pseudo-index of your larger structure where each element is a reference to the actual data, keyed of course by the query). The point is to construct a key that will collapse your slight variants of your queries, while still being distinct enough to not collapse everything.
Have a look at The Uniqueness of hashes. if you have time.
-InjunJoel
"I do not feel obliged to believe that the same God who endowed us with sense, reason and intellect has intended us to forego their use." -Galileo
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