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In the second part of the Strecker Synthesis the nitrile nitrogen of the aminonitrile is protonated , and the nitrile carbon is attacked by a water molecule .
 person: Strecker
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: Strecker 
Answer:
 person: Strecker