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periodic▼[UK: ˌpɪə.rɪ.ˈɒ.dɪk] [US: ˌpɪ.ri.ˈɑː.dɪk]
periodical▼[UK: ˌpɪə.rɪ.ˈɒ.dɪk.l̩] [US: ˌpɪ.ri.ˈɑː.dɪk.l̩]
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