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He contested East Tyrone in 1910 before becoming a Unionist Member of Parliament ( MP ) for East Down from 1918 to 1922 , when the constituency was abolished .
 organization: Unionist; location: East Down
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: Unionist, East Down 
Answer:
 organization: Unionist; location: East Down