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