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Spell correction
Two principal uses
Correcting document(s) being indexed
Correcting user queries to retrieve “right” answers
Two main flavors:
Isolated word
Check each word on its own for misspelling
Will not catch typos resulting in correctly spelled words
e.g., from →form
Context-sensitive
Look at surrounding words,
e.g., I flew form Heathrow to Narita.
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