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The wing of the C. 12 was a cantilever , thick aerofoil section , low aspect ratio structure built around two wooden box spar s , covered with three-ply ahead of the forward spar and fabric behind .
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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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