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There were already ascetic hermits ( the " Therapeutae " ) , and loosely organized cenobitic communities were described by the Jewish philosopher Philo of Alexandria in the 1st century " as long established in the harsh environment of Lake Mareotis and in other less accessible regions .
 Philo, Alexandria, Lake Mareotis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Philo, Alexandria, Lake Mareotis