8000
Since they made their appearance in the  Mexican League  in summer 1954 the Lions have had fierce rivalries first with the  Mexico  City Diablos Rojos and the Mexico City Tigres and then from 1980 with the Campeche Piratas .
 country of headquarters: Mexican League, Mexico
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:  Mexican League, Mexico 
Answer:
 country of headquarters: Mexican League, Mexico