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The few disease-resistant selections made available to the public to date include ' Valley Forge ' , ' New Harmony ' , ' Princeton ' , ' Jefferson ' , and a set of six different clones collectively known as ' American Liberty ' .
 Valley Forge, New Harmony, Princeton, American Liberty
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Valley Forge, New Harmony, Princeton, American Liberty