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As early as 1693 Christiaan Huygens found that the volume and the surface area of the pseudosphere are finite , despite the infinite extent of the shape along the axis of rotation .
 person: Christiaan Huygens
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: Christiaan Huygens 
Answer:
 person: Christiaan Huygens