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The term " Systematic art " was coined by Lawrence Alloway in 1966 as a description of the method artists , such as Kenneth Noland , Al Held and Frank Stella , were using for composing abstract paintings .
 Lawrence Alloway, Kenneth Noland, Al Held, Frank Stella
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Lawrence Alloway, Kenneth Noland, Al Held, Frank Stella