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Boucher ruled out simultaneous steps by both sides , stressing that Washington would not consider such moves until the " verifiable and irreversible termination " of the north ' s nuclear programs .
 geographical social political: both sides; geographical social political: Washington; geographical social political: the north; person: Boucher
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 geographical social political: both sides; geographical social political: Washington; geographical social political: the north; person: Boucher