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In 2008 three of Arnold Lobel 's uncolored , unpublished , Frog and Toad books were discovered in an estate sale .
 person: Arnold Lobel
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: Arnold Lobel 
Answer:
 person: Arnold Lobel