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After the War he became British Representative at the International Commission in Teschen in Poland before becoming an Instructor in Tactics at the Royal School of Military Engineering in 1923 .
 location: Teschen; location: Poland; organization: Royal School of Military Engineering
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: Teschen, Poland, Royal School of Military Engineering 
Answer:
 location: Teschen; location: Poland; organization: Royal School of Military Engineering