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one by one▼◼◼◼(individually)adverb[UK: wʌn baɪ wʌn] [US: wʌn baɪ wʌn]
one at a time▼◼◼◻(individually)adverb[UK: wʌn ət ə ˈtaɪm] [US: wʌn ət ə ˈtaɪm]
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