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Development of bilateral relations Nepal and Pakistan signed a protocol for establishing diplomatic relations in 1962 and exchanged ambassador s and set up embassies in 1963 , when Ayub Khan , the President of Pakistan made a special visit to Nepal .
 Nepal, Pakistan, Ayub Khan, Pakistan, Nepal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nepal, Pakistan, Ayub Khan, Pakistan, Nepal