11339
The station commenced broadcasting on May 25 1953 from the Ezekiel W. Cullen Building on the University of Houston campus as the first public television station in the  United States  and one of the earliest stations of  National Educational Television  ( NET ) which eventually merged into PBS .
 country of headquarters: United States, National Educational Television
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: United States, National Educational Television