31521
They are not , however , party to the European Union Customs Union .
 organization: European Union Customs Union
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: European Union Customs Union 
Answer:
 organization: European Union Customs Union