6451
The  Escuela Nacional Preparatoria  ( ) ( ENP ) the oldest senior high school system in Mexico belonging to the National Autonomous University of Mexico (  UNAM  ) opened its doors on February 1 1868 .
 members: Escuela Nacional Preparatoria, UNAM
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:
 members: Escuela Nacional Preparatoria, UNAM