188220
From 1981-1985 Lien Khuong Airport served civil service filghts with Ho Chi Minh City - Lien Khuong route ( one filght weekly ) on AK40 Aircraft but all civil flights was suspended due to low passenger traffic .
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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:  
Answer:
 None