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There are 803 eighteen-letter words containing A, C, G, 2I and O

(page 5)

osteoimmunologicaloutintellectualingovercategorizationoverglorificationsoversignificationspalaeoclimatologicpalaeohistologicalpalaeoichnologicalpalaeolimnologicalpalaeomicrobiologypaleobiogeographicpaleobiolinguisticpaleoclimatologistpaleoglaciologicalpaleoichthyologistpaleophysiologicalpaleornithologicalpaleoseismologicalpanbiogeographicalpancreatectomizingpancreaticogastricPangasinan␣provinceparagastrioceratidpathophysiologicalpatristic␣anthologypattern␣recognitionpedestrian␣crossingpenetration␣pricingpescovegetarianismpharmacoepigeneticpharmacogeneticistpharyngoepiglotticphonocardiographicphonomicrosurgicalphotoallergenicityphotographic␣artistphotomicrographingphotophysiologicalphylostratigraphicphysicotheologicalphysiogeographicalphysiopathologicalphytopathogenicityphytophysiologicalphytotoxicologicalpicking␣and␣choosingpicking␣one's␣battlespicornavirologistspicroindigocarminepigeon␣fancier's␣lungpig-footed␣bandicootplurisignificationpolitical␣marketingpopulation␣geneticsPortuguesificationpostcentrifugationpostdiagnosticallypostlinguisticallypragmaticalisationpragmaticalizationpragmatic␣sanctionsprice-earnings␣ratioproduction␣brigadesprognostificationsprolymphangiogenicpronunciation␣guidepropagandisticallypropositional␣logicprotocoligoricallypseudobiographicalpseudobiologicallypsychobiographicalpsychobiologicallypsychogeriatricianpsycholinguisticalpsychological␣slipspsychologisticallypsychosociologicalptilochronologicalpupillographicallyputs␣lipstick␣on␣a␣pigquasimonoenergeticquodlibetificatingracial␣integrationsradii␣of␣convergenceradioactive␣datingsradiocarbon␣datingsradiochronologicalradiocinematographradioimmunologicalradiological␣weaponradiometric␣datingsradiomorphologicalradiotoxicologicalraining␣cats␣and␣dogsrat␣printing␣officesreconceptualizingsreconfigurationismrectangularizationregional␣insourcingregistration␣countyRegulation␣Charliesrejection␣samplingsreligious␣educationreprotoxicologicalRepublic␣of␣BulgariareticulogeniculateRhodesian␣Ridgebackriding␣associationsriding␣the␣coattailsright-wing␣socialismring␣down␣the␣curtainring-tailed␣macaucosrolling␣resistancessalpingoscopicallysalpingovariectomysandwich␣generationsanguinophlegmaticscansoriopterigidsscansoriopterygidsscarabaeidologistsscattering␣functionsedimentologicallyseismocardiographysemantic␣borrowingssemantic␣versioningsemiapologeticallysemibiographicallysemi-boarding␣schoolsemihallucinogenicsemiphlogisticatedserodiagnosticallyshielding␣constantsshipping␣containersshouting␣dictationssialoglycopeptidessialoglycoproteinssialoglycosylationsialylglycopeptidesialylglycoproteinsigillographicallysignal␣transductionsilicotungstic␣acidsleeping␣dictionarysneaking␣suspicionssocial␣psychologiessociodemographical

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