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Taking his opponents by surprise and creating uncertainty in their minds were key elements in Rommel 's approach to offensive warfare : he took advantage of sand storms and the dark of night to conceal the movement of his forces .
 person: Rommel
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: Rommel 
Answer:
 person: Rommel