Assertion: hummingbird's tail feather | /r/CapableOf | add another 6 - 7 inches
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Source sentences:
text: The Black-billed Streamerbirds measure about 3.25 - 3.5 inches (9 - 10 cm) in length; the long tail feathers of the males (streamers) add another 6 - 7 inches (15 - 18 cm).