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There are 57 twelve-letter words beginning with OCT

octaacetatesoctabromidesoctachlorideoctacontagonoctacosanoicoctacosanolsoctactiniansoctadecagonsoctadecamersoctadecanoicoctadecanoidoctadecanoyloctadecenoicoctadecenolsoctadecenoyloctaeteridesoctagenarianoctahedrallyoctahedricaloctahydratesoctamerizingoctanedionesoctane␣numberoctangularlyoctanoic␣acidoctanoylatedoctapeptidesoctasilicateoctasiloxaneoctastichousoctasyllabicoctave␣flutesoctaviationsoctavofinalsoctillionthsoctobassistsOctober␣beersoctocellularoctochaetidsoctodecanoidoctodontoidsoctogenarianoctogenariesoctopetalousoctopodiformoctopusesqueoctopyranoseoctoradiatedoctospermousoctostichousoctosyllabicoctosyllableoctriptylineoctuplicatedoctuplicatesoctupolarityoctyl␣gallate

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