889
There was a bit of a firefight when the 7th Cavalry came upon three Soviet vintage 20 - millimeter anti - aircraft guns , ack - ack guns .
 geographical social political: Soviet; person: the 7th Cavalry; weapon: three Soviet vintage 20 - millimeter anti - aircraft guns; weapon: ack - ack guns
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
 Entities: Soviet, the 7th Cavalry, three Soviet vintage 20 - millimeter anti - aircraft guns, ack - ack guns 
Answer:
 geographical social political: Soviet; person: the 7th Cavalry; weapon: three Soviet vintage 20 - millimeter anti - aircraft guns; weapon: ack - ack guns