41084
Now the United States Postal Service may be displaying a similar rebellious streak : tomorrow at the huge Sturgis motorcycle rally in the Black Hills of South Dakota , the Postal Service will issue a set of four stamps that depict classic American bikes .
 company industry: United States Postal Service, Postal Service
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  United States Postal Service, Postal Service 
Answer:
 company industry: United States Postal Service, Postal Service