21038
 President Richard M. Nixon and Henry A. Kissinger , then the national security adviser , were imaginative enough to accept the invitation to visit China from Chairman Mao Zedong and Prime Minister Zhou Enlai , even though neither Ping-Pong nor a simple visit touched on the basic issues between China and the United States . 
 nationality: Zhou Enlai, China; nationality: Mao Zedong, China
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: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 nationality: Zhou Enlai, China; nationality: Mao Zedong, China