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There are 107 eighteen-letter words containing I, 4O and 2P

autolipophagosomesBononian␣phosphoruschlorophototrophicchloropyromorphitechromophotographicchronophotographiccommon␣hippopotamuscomparison␣operatorcompound␣microscopecompound␣proportioncomproportionatingcomproportionationcopromicroscopicalcoproparasitologiccoproparasitoscopycoproporphyrinogencounteroppositionscounterpropositiondisproportionationDoctor␣of␣Philosophydrop␣like␣a␣hot␣potatoeosinophilopoiesiseosinophilopoieticepipodophyllotoxinglucolipoapoptosisharmonic␣proportionmonoisopropylaminemonophosphokinasesmonothiophosphatesmorphopathologicalmorphophonologicalmorphophonologistsnonanthropomorphicnonphosphorylationnonproportionalityoctabromoporphyrinoligooxopiperazineopsonophagocytosisopsonophagocytoticorthopneic␣positionostarioclupeomorphout␣of␣all␣proportionoverproportionallypathomorphologicalperiodontopathogenphosphocholinationphosphoisoprenoidsphospholipoproteinphosphometabolomicphosphoneoepitopesphosphonodithioatephosphonopentanoicphosphorecognitionphosphoriboproteinphosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphotochronographicphotodecompositionphotofluorographicphotoglottographicphotoheterotrophicphotoincorporationphotomorphogenesisphotomorphogeneticphotomorphologicalphoto␣opportunitiesphotoorganotrophicphotoperoxidationsphotophysiologicalphotoreproductionsphotospectroscopicphototopographicalphytomorphologicalphytomorphologistsphytophototoxicitypicophotoautotrophpolydolopimorphianpolyphloroglucinolproapolipoproteinspromorphologicallypropiomelanocortinpropositional␣logicproposition␣nationsproteolipoproteinsprothoracicotropicprotochlorophilideProto-Indo-Europeansprotoporphyrinogenprotopsychologicalprotopsychologistsproximoposteriorlypseudoprotodioscinpyrophosphorolysispyrophosphorolyticpyropoikilocytosissalpingooophoritis salpingo-oophoritissociophilosophicalsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspongiotrophoblastsulfoniopropionatesymproportionationzoosporangiophores

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