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On 30 September , Zhou Enlai warned the US that China was prepared to intervene in Korea if the US crossed the 38th Parallel .
 Zhou Enlai, US, China, Korea, US, 38th Parallel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zhou Enlai, US, China, Korea, US, 38th Parallel