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Subsequent to Richard Wallace 's 2001 publication of an AIML specification , numerous other developers have taken up where Wallace left off , implementing free and open source AIML interpreters in a variety of programming languages , publishing AIML sets in various human languages , and continuing the spread of the technology as a free/open source venture .
 Wallace, Wallace
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Wallace, Wallace