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Design researcher Nigel Cross conducted studies in the 1960 s with " simulated " computer-aided design systems where the purported simulator was actually a human operator , using text and graphical communication via CCTV .
 Nigel Cross
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:
 Nigel Cross