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With the fall of the Soviet Union and with Vietnam 's decreased ability to provide assistance , Laos has sought to improve relations with its regional neighbours .
 location: Soviet Union; location: Vietnam; location: Laos
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: Soviet Union, Vietnam, Laos 
Answer:
 location: Soviet Union; location: Vietnam; location: Laos