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Normalization to terms
We need to “normalize” words in indexed text as well as query words into the same form
We want to match U.S.A. and USA
Result is terms: a term is a (normalized) word type, which is an entry in our IR system dictionary
We most commonly implicitly define equivalence classes of terms by, e.g.,
deleting periods to form a term
U.S.A., USA ⌊ USA
deleting hyphens to form a term
anti-discriminatory, antidiscriminatory ⌊ antidiscriminatory
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