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Without preference for either theory , they constructed a single continuous battlefield boundary that encompasses the locations proposed by both Williams and Foss .
 person: Williams; person: Foss
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: Williams, Foss 
Answer:
 person: Williams; person: Foss