9971
The blast occurred as workers were unloading a coolant used for steam generators at the Muskingum River plant said Melissa McHenry a spokeswoman for  American Electric Power  based in Columbus  Ohio  .
 state or province of headquarters: American Electric Power, Ohio
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 state or province of headquarters: American Electric Power, Ohio