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Electoral systems with election of just one winner in each district ( i.e. , " winner-takes-all " electoral systems ) and no proportional distribution of extra mandates to smaller parties tend to create two-party systems ( Duverger 's law ) .
 person: Duverger
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: Duverger 
Answer:
 person: Duverger