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The rules proposed by California and 16 other states meant to ratchet down greenhouse gas emissions are precluded by federal power  EPA  Administrator  Stephen L. Johnson  said .
 EPA, Stephen L. Johnson
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 EPA, Stephen L. Johnson