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At this time she also befriended the artists Willem de Kooning , Mark Rothko , and Jackson Pollock .
 Willem de Kooning, Mark Rothko, Jackson Pollock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Willem de Kooning, Mark Rothko, Jackson Pollock