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The muralist Kent Twitchell painted an 11,000 - square-foot mural in Downtown Los Angeles to honor Ruscha entitled the " Ed Ruscha Monument " between 1978 and 1987 .
 Kent Twitchell, Downtown Los Angeles, Ruscha, Ed Ruscha Monument
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kent Twitchell, Downtown Los Angeles, Ruscha, Ed Ruscha Monument