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There are several safety warnings given to passengers , such as the traditional ' mind the gap ' announcement and the regular announcements for passengers to keep behind the yellow line .
 organization: safety
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: safety 
Answer:
 organization: safety