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Parse the indexed text and perform part-of-speech-tagging (POST).
Bucket the terms into (say) Nouns (N) and articles/prepositions (X).
Call any string of terms of the form NX*N an extended biword.
Each such extended biword is now made a term in the dictionary.
Example: catcher in the rye
N X X N
Query processing: parse it into N’s and X’s
Segment query into enhanced biwords
Look up in index: catcher rye
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