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The ringed salamander ( Ambystoma annulatum ) is native to hardwood and mixed hardwood-pine forested areas in and around the Ozark Plateau and Ouachita Mountains of Arkansas , Oklahoma , and Missouri .
 Arkansas, Oklahoma, Missouri
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Arkansas, Oklahoma, Missouri