Question: IR Models (e.g., Boolean and Vector Space) approximate English semantics in a computationally tractable way. To properly account for co-references (e.g., pronouns, acronyms, and aliases),

IR Models (e.g., Boolean and Vector Space) approximate English semantics in a computationally tractable way. To properly account for co-references (e.g., pronouns, acronyms, and aliases), TF-IDF scores determined syntactically should be modified appropriately. Explain what factors will be effected in the presence of co-references and how? Provide a brief justification, with an illustrative example.

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