383008
Patent Cooperation Treaty Under the Patent Cooperation Treaty , notably provides that the drawings are required when they are necessary for the understanding of the invention .
 organization: Patent; organization: Patent
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: Patent, Patent 
Answer:
 organization: Patent; organization: Patent