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Using ionic liquids made in part by vitamin B4 ( choline chloride ) a group of chemists from the  University of Leicester   UK  is able to remove glycerol the main by-product of vegetable oil-based biodiesel which if left in biodiesel would damage engines according to a press release on Thursday by the university .
 country of headquarters: University of Leicester, UK
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:
 country of headquarters: University of Leicester, UK