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  • Each vocabulary term is hashed to an integer

    • (We assume you’ve seen hashtables before)

  • Pros:

    • Lookup is faster than for a tree: O(1)

  • Cons:

    • No easy way to find minor variants:

      • judgment/judgement

    • No prefix search [tolerant retrieval]

    • If vocabulary keeps growing, need to occasionally do the expensive operation of rehashing everything

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