6. Consider these documents: Doc 1 breakthrough drug for schizophrenia Doc 2 new schizophrenia drug Doc 3 new approach for treatment of schizophrenia Doc 4 new hopes for schizophrenia patients a. Draw the term-document incidence matrix for this document collection. For this document collection, what are the returned results for these queries: a. schizophrenia AND drug b. for AND NOT(drug OR approach)

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