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once in two years▼◼◼◼[UK: wʌns ɪn ˈtuː ˈjiəz] [US: ˈwəns ɪn ˈtuː ˈjɪr̩z]
biennially▼[UK: baɪ.ˈe.nɪə.li] [US: baɪ.ˈe.nɪə.li]
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