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Clear title to the land did not occur until 1873 , when a U.S. District Court upheld Burnett 's purchase against a suit filed by Avila heir Tomas Avila Sanchez .
 Avila, Tomas Avila Sanchez
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Avila, Tomas Avila Sanchez