373982
After graduation , he clerked for Chief Judge Richard H. Chambers of the U.S. Court of Appeals for the Ninth Circuit , and then began practicing in the Washington , D.C. office of Covington & Burling .
 location: Washington , D.C.; organization: Covington & Burling
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: Washington , D.C., Covington & Burling 
Answer:
 location: Washington , D.C.; organization: Covington & Burling