15055
The savage US bombing of  Cambodia  the corruption of the  Lon Nol  regime and the unwillingness of the administration of US president Richard Nixon to talk to Sihanouk who had taken refuge in Beijing as well as changes in the leadership of China after prime minister Zhou Enlai's death all catapulted the Khmer Rouge to victory in April 1975 .
 None
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:   
Answer:
 NA: Cambodia, Lon Nol