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In the 1950 s and 1960 s , Jean-Pierre Serre and Alexander Grothendieck recast the foundations making use of sheaf theory .
 person: Jean-Pierre Serre; person: Alexander Grothendieck
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: Jean-Pierre Serre; person: Alexander Grothendieck