7720
According to Lee Yun-ping chairman of the  Chinese  historical society  Sun  needed a certificate to enter the United States at a time when the Chinese Exclusion Act of 1882 would have otherwise blocked him .
 origin: Chinese, Sun
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:
 origin: Chinese, Sun