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The school first opened under the name of  Sanford   Central High School  in 1951 .
 city of headquarters: Sanford, Central High School
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Sanford, Central High School 
Answer:
 city of headquarters: Sanford, Central High School