29424
 Think of President Richard M. Nixon 's trip to China , the trip by President Anwar el-Sadat of Egypt to Jerusalem , and Nelson Mandela 's negotiations with President F.W. de Klerk of South Africa . 
 Nelson Mandela, South Africa
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 Nelson Mandela, South Africa