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There are 306 eighteen-letter words containing I, O, 2P, 2R and T

(page 2)

pharmacopsychiatrypharmacotherapistsphilanthropreneursphosphogartrellitephosphoriboproteinphosphorrössleritephosphorylcreatinephosphotransmitterphosphotriesterasephotochronographicphotofluorographicphotographic␣artistphotographic␣memoryphotographic␣papersphotoheterotrophicphotoincorporationphotolithographersphotomicrographersphotomicrographingphotoorganotrophicphotoperturbationsphotoreproductionsphotorespirometersphotospectrometricphrasal␣prepositionphthirapterologistphylostratigraphicphylotranscriptomepiperonylonitrilesplagiogravitropismpleuraspidotheriidpolitical␣prisonersporphyrinogenicityportal␣hypertensionPortuguese␣Republicpostpericardiotomypostranscriptionalpostrepolarizationpreinterpretationsprephosphorylatingprephosphorylationprepositional␣verbspreproneuropeptidepreprosomatostatinprescription␣bottlepresenting␣problemspresent␣progressivepretermitted␣spousepretranscriptionalpretransplantationprimary␣hypothermiaPrince␣Rupert's␣dropsprinciple␣of␣charityprinter's␣apostropheprior␣probabilitiesproapolipoproteinsprobationary␣periodprocardiomyopathicprofessional␣sportsproper␣accelerationpropiomelanocortinproportionablenessproportionlessnessproposition␣playersproprietary␣eponymsproprietary␣tradingpropriosensitivityprosperity␣doctrineprosperity␣theologyproteolipoproteinsprothoracicotropicprotochlorophilideProto-Indo-Europeansprotoplanetary␣discprotoplanetary␣diskprotoporphyrinogenproximate␣principleproximoposteriorlypseudohypertrophicpterocarpanquinonepteromerhanophobiapterylographicallyPuretic␣power␣blockspurinergic␣receptorpurple␣loosestrifespyrophosphorolyticpyrophosphorylyticPythagorean␣triplesread-eval-print␣loopsreality␣pornographyrephosphorylationsrespiratory␣pigmentrespondeat␣superiorresumptive␣pronounsreverse-pickpockets reverse␣pickpocketsscissors␣paper␣stoneseparation␣of␣powerssharp-tailed␣sparrowsocial␣partnershipssole␣proprietorshipsolitary␣sandpiperssomatoparaphreniassonospectrographicspecial␣prosecutorsspecial␣rapporteursspectrobolographicspectrodichrographspectrographicallyspectroheliographsspectroheliographyspectromicroscopicspectrophotometricspectropolarimeterspectropolarimetryspectropolariscopeSportsman's␣Paradisestereophotographicstraight␣apostrophestriped␣swampdragonsuperimpregnationssuperiority␣complexsupermicrocomputersuperminicomputerssupernova␣impostorssuperpersonalitiessymproportionationtephrostratigraphytertiary␣phosphinestetratricopeptidesthird-person␣pluralsthromboprophylaxisthrombosuppressionthrombosuppressivetranspolyisoprenestranspyloric␣planestrapeziometacarpaltriazolopiperazinetricresyl␣phosphatetriisopropylsilanetrimethylolpropanetriphosphoric␣acidstriphosphorylationtropical␣depressionturpentine␣of␣Cyprustypographical␣errorunderapproximating under-approximating

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