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The Buckingham π theorem describes how every physically meaningful equation involving " n " variables can be equivalently rewritten as an equation of dimensionless parameters , where " m " is the rank of the dimensional matrix .
 person: Buckingham
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: Buckingham 
Answer:
 person: Buckingham