I'm creating a list of bigrams from a document like this:

bigrams = WordCounts[Document, 2]

This gives me an association with the number of times a bigram appears. What I need to be able to do is lookup a key, The data looks like this:

<|{"of", "the"} -> 517, {"to", "the"} -> 371, {"in", "the"} ->  361, {"united", "states"} -> 245,|>

I've also got a list of bigram stop words.

stopWords = WordData[All, "Stopwords"];
bigramStopWords = Tuples[stopWords, 2];

What I'm looking to do is remove all instances in the stopwords list from the bigram list. I can't figure out how to do a lookup with the association being made up of a two item list. Any help would be appreciated.