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An advantage of the Gaussian CGS system is that electric and magnetic fields have the same units , 4 " πε " is replaced by 1 , and the only dimensional constant appearing in the Maxwell equations is " c " , the speed of light .
 person: Gaussian; person: Maxwell
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: Gaussian, Maxwell 
Answer:
 person: Gaussian; person: Maxwell