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Modern Grenadiers were formed in the early 1940s , originating from the " Infantry Pioneers " trained by Chief instructor Matthias Brunner , the commander of a riflemen company who developed a close combat technique in the shooting schools of Walenstadt .
 location: Walenstadt
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: Walenstadt 
Answer:
 location: Walenstadt