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As the biomechanical tattoo art style became increasingly popular , tattoo artists such as Guy Aitchison and Aaron Cain began designing their own original , biomechanical art , creating one of tattoo 's most popular contemporary tattoo art movements .
 Guy Aitchison
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Guy Aitchison