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Lyle Richard Campbell ( born 1942 ) is a linguist and leading expert on indigenous American languages — especially those of Mesoamerica — and on historical linguistics in general .
 Lyle, Campbell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lyle, Campbell