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once in a while▼◼◼◼adverb[UK: wʌns ɪn ə waɪl] [US: ˈwəns ɪn ə ˈwaɪl]
once in a blue moon▼◼◻◻adverb[UK: wʌns ɪn ə bluː muːn] [US: ˈwəns ɪn ə ˈbluː ˈmuːn]
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