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The Bird-Cage House and other Tropotypes before it , utilized passive-energy designs making them extremely energy-efficient and contained an ambiguous living envelope to encourage what was considered at the time to be a healthy , simultaneous indoor‐outdoor lifestyle .
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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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