7673
Kansas  's other Republican Senator  Sam Brownback  announced that he is retiring due to self-imposed term limits which meant Roberts became the senior Senator from Kansas in 2011 .
 employee of: Kansas, Sam Brownback
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:
 employee of: Kansas, Sam Brownback