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Collaborators on the SGA projects also included Michael Artin ( étale cohomology ) and Nick Katz ( monodromy theory and Lefschetz pencils ) .
 person: Michael Artin; person: Nick Katz; person: Lefschetz
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Michael Artin; person: Nick Katz; person: Lefschetz