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bottom stair but one▼[UK: ˈbɒ.təm steə(r) bʌt wʌn] [US: ˈbɑː.təm ˈster ˈbət wʌn]
topmost stair but one▼[UK: ˈtɒp.məʊst steə(r) bʌt wʌn] [US: ˈtɒpmoʊst ˈster ˈbət wʌn]
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