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In his science fiction novel " The Languages of Pao " the author Jack Vance describes how specialized languages are a major part of a strategy to create specific classes in a society , to enable the population to withstand occupation and develop itself .
 The Languages of Pao, Jack Vance
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 The Languages of Pao, Jack Vance