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The Peace Pledge Union ( PPU ) took part in their distribution from 1934 , and white poppy wreaths were laid from 1937 as a pledge to peace that war must not happen again .
 organization: Peace Pledge 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: Peace Pledge Union 
Answer:
 organization: Peace Pledge Union