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He received the Turing Award from the Association for Computing Machinery in 1988 for the invention of Sketchpad , an early predecessor to the sort of graphical user interface that has become ubiquitous in personal computers .
 Association for Computing Machinery
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Association for Computing Machinery