8939
During the " downtime " CN changed their plans , and in 1971 a rebuild program began , converting the five seven-car sets to three nine-car sets .
 organization: CN
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: CN 
Answer:
 organization: CN