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As Bertha Harris , author of many novels including Lover , once wrote : " Between the time of Sappho and the birth of Natalie Clifford Barney lies a ' lesbian silence ' of twenty-four centuries . "
 Bertha Harris, Natalie Clifford Barney
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bertha Harris, Natalie Clifford Barney