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In addition , he published two volumes of criticism , Opposing Poetries : Volume One — Issues and Institutions and Opposing Poetries : Volume Two — Readings with Northwestern University Press ( 2006 ) , and edited a collection of essays by various writers and critics ( including Helen Vendler ) , What is a Poet ?
 organization: Northwestern University Press; person: Helen Vendler
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Northwestern University Press, Helen Vendler 
Answer:
 organization: Northwestern University Press; person: Helen Vendler