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There are 836 eighteen-letter words containing I, O, 2P and S

(page 4)

phosphorylcholinesphosphorylcreatinephosphosaccharidesphosphoselectivityphosphosensitivityphosphospecificityphosphotransmitterphosphotriesterasephotoconceptualismphotoconceptualistphotodecompositionphotoencapsulationphotographic␣artistphotographic␣papersphotographic␣platesphotolithographersphotomicrographersphotomorphogenesisphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotoperturbationsphotophysiologicalphotoreproductionsphotorespirometersphotospectrometricphotospectroscopicphotothermoplasticphrasal␣prepositionphthirapterologistphylostratigraphicphylotranscriptomephysical␣geographerphysiogeographicalphysiopathogenesisphysiopathologicalphysiopathologistsphytomorphologistsphytophysiognomiesphytophysiologicalphytoplanktivorouspick␣up␣the␣threads␣ofpiezopsychrophilicpiperonylonitrilespiss␣money␣up␣the␣wallplagiogravitropismplain␣brown␣wrappersplainclothespersonplanning␣permissionplatform␣capitalismplethysmographicalpleuraspidotheriidplusquamperfectionpneumotherapeuticsPointe␣Coupee␣Parishpoisoned␣complimentpolitical␣prisonerspolitical␣spectrumspolychemotherapiespolychromatophilespolydispersibilitypolydispersivitiespolypharmacologiespolyphenoloxidasespolyphenylalanines poly-phenylalaninespolyphosphoric␣acidpolysomnographicalpolysomnographistspolysporangiophytePont-Audemer␣Spanielpontomesencephalicpopping␣the␣questionpopular␣etymologiespopulation␣geneticspopulation␣pyramidspop-up␣advertisementporprismacovirusesportal␣hypertensionPortuguese␣Republicpositional␣asphyxiapossessive␣pronounspostconceptionallypostconceptualistspostdepositationalpostdepositionallypostencephalitidespostimplementationpost-impressionismspostimpressionistspostmultiplicationpostpericardiotomypostpolymerizationpostprecipitationspostpsychoanalyticpostranscriptionalpostrepolarizationpotassium␣feldsparspotato␣chip␣of␣the␣seaPowerPointlessnessprecompositionallypredispositionallypreferred␣providersprehospitalizationpreinterpretationspremultiplicationsprephosphorylatingprephosphorylationprepositional␣casesprepositional␣verbspreposition␣of␣placepreprofessionalismpreprosomatostatinprescription␣bottlepresenting␣problemspresent␣progressivepresuppositionallypresuppositionlesspresymptomaticallypretermitted␣spousepretranscriptionalpretransplantationprime␣decompositionPrince␣of␣Wales␣spursPrince␣Rupert's␣dropsprinter's␣apostropheprior␣probabilitiesprismatic␣compassesprisoner-of-war␣campsproapolipoproteinsprofessional␣sportsprogressive␣suppersprogressive␣web␣appsProgress␣Pride␣flagspropagandisticallypropionylpromasineproportionablenessproportionlessnesspropositional␣logicproposition␣nationsproposition␣playersproprietary␣eponymspropriosensitivityprosopographicallyprosperity␣doctrineprosperity␣theologyprospidium␣chloride

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