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St. Charles High School  is a public high school serving grades 9 through 12 in the city of  St. Charles  Missouri USA .
 city of headquarters: St. Charles High School, St. Charles
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:
 city of headquarters: St. Charles High School, St. Charles