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Whether a standalone TVA ( such as Citel 's Portico TVA ) or a hybrid PBX is deployed , the intention is to preserve investment in an installed base of telephone handsets , and remove the need to install ethernet infrastructure .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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