6412
Riordan created the fictional character Percy Jackson and his travels across the  United States  to recover Zeus's  lightning bolt  .
 countries of residence: United States, lightning bolt
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:  United States, lightning bolt 
Answer:
 countries of residence: United States, lightning bolt