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There are 456 eighteen-letter words containing I, 2O, 2P, R and T

(page 3)

postimpressionistspostpericardiotomypostpolymerizationpostprecipitationspostranscriptionalpostrepolarizationpower␣of␣appointmentPowerPointlessnessprecompositionallypredispositionallyprehospitalizationprephosphorylatingprephosphorylationprepositional␣casesprepositional␣verbspreposition␣of␣placepreproneuropeptidepreprosomatostatinprescription␣bottlepresuppositionallypresuppositionlessprime␣decompositionprinter's␣apostropheprior␣probabilitiesproapolipoproteinsprobationary␣periodprocardiomyopathicprofessional␣sportsproper␣accelerationpropiomelanocortinproportionablenessproportionlessnesspropositional␣logicproposition␣nationsproposition␣playersproprietary␣eponymspropriosensitivitypropylketobemidoneprosperity␣doctrineprosperity␣theologyproteocephalideansproteolipoproteinsprothoracicotropicprotoanthophylliteprotochlorophilideProto-Indo-Europeansprotoplanetary␣discprotoplanetary␣diskprotoplanetesimalsprotoporphyrinogenprotopsychologicalprotopsychologistsprototype␣extensionproximoposteriorlypseudohypertensionpseudohypertrophicpseudohyponatremiapseudoimprovementspseudophotographicpseudoprotodioscinpseudopterostigmaspseudoreplicationspsychic␣photographypsychographologistpsychoprophylacticpterocarpanquinonepteromerhanophobiaPuretic␣power␣blockspurple␣loosestrifespyelonephritogenicpyrophosphorolyticpyrophosphorylyticpyropoikilocytosisradiculoplexopathyread-eval-print␣loopsreality␣pornographyrephosphorylationsrespondeat␣superiorresumptive␣pronounsrhinoseptoplastiessalpingooophoritis salpingo-oophoritisSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescissors␣paper␣stoneself-preoccupationssemiphosphorescentseparation␣of␣powersseptorhinoplastiessole␣proprietorshipsomatoparaphreniassonospectrographicsoprano␣saxophonistspecial␣prosecutorsspectrobolographicspectrodichrographspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromicroscopicspectrophotometricspectropolarimeterspectropolarimetryspectropolariscopespirocycloheptanesspirocyclopentanesspondylotherapistsspongiotrophoblastspurious␣diphthongsstereophotographicstraight␣apostrophesulfoniopropionatesupercompensationssupercomputationalsuperiority␣complexsupermicrocomputersupernova␣impostorssuperoleophobicitysuperpositionalitysymplectomorphismssymproportionationtetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthromboprophylaxisthrombosuppressionthrombosuppressivetin-pot␣dictatorshiptranspolyisoprenestriazolopiperazinetriisopropylsilanetrimethylolpropanetriphosphoric␣acidstriphosphorylationtropical␣depressiontryptophylquinonestype␣introspectionstypographical␣errorunderapproximation under-approximationunphiloprogenitiveupdating␣one's␣priorsureteropyeloscopicvertical␣apostrophevideo␣photographers

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