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There are 584 eighteen-letter words containing I, 2O, 2P and T

(page 4)

protoanthophylliteprotochlorophilideProto-Indo-Europeansprotoplanetary␣discprotoplanetary␣diskprotoplanetesimalsprotoporphyrinogenprotopsychologicalprotopsychologistsprototype␣extensionproximoposteriorlypseudohypertensionpseudohypertrophicpseudohyponatremiapseudoimprovementspseudopathologicalpseudophotographicpseudopolycythemiapseudoprotodioscinpseudopsychopathicpseudopterostigmaspseudoreplicationspsychic␣photographypsychographologistpsychomanipulationpsychopathologicalpsychopathologistspsychopathologizedpsychopathologizespsychophoneticallypsychophysiologistpsychoprophylacticpterocarpanquinonepteromerhanophobiaPuretic␣power␣blockspurple␣loosestrifesput␣someone's␣pipe␣outpyelonephritogenicpyrophosphorolyticpyrophosphorylyticpyropoikilocytosisradiculoplexopathyread-eval-print␣loopsreality␣pornographyrephosphorylationsrespondeat␣superiorresumptive␣pronounsrhinoseptoplastiessalpingooophoritis salpingo-oophoritisSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescissors␣paper␣stoneself-preoccupationssemiphosphorescentseparation␣of␣powersseptorhinoplastiessialoglycopeptidessole␣proprietorshipsomatoparaphreniassonospectrographicsoprano␣saxophonistspecial␣prosecutorsspectrobolographicspectrodichrographspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromicroscopicspectrophotometricspectropolarimeterspectropolarimetryspectropolariscopespeech␣pathologistssphingophosphatidespirocycloheptanesspirocyclopentanesspondylodysplasticspondylotherapistsspongiotrophoblastspurious␣diphthongsstereophotographicstop-and-go␣penaltiesstraight␣apostrophesubspace␣topologiessulfoglycopeptidessulfoniopropionatesupercompensationssupercomputationalsuperiority␣complexsupermicrocomputersupernova␣impostorssuperoleophobicitysuperpositionalitysupposititiousnesssymplectomorphismssymproportionationtechnophilosophiestenoepiphysiodesistetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthromboprophylaxisthrombosuppressionthrombosuppressivetin-pot␣dictatorshiptopside␣developmenttranspolyisoprenestriazolopiperazinetriisopropylsilanetrimethylolpropanetriphosphoric␣acidstriphosphorylationtropical␣depressiontryptophylquinonestype␣introspectionstypographical␣errorunderapproximation under-approximationunphiloprogenitiveupdating␣one's␣priorsureteropyeloscopicvertical␣apostrophevideo␣photographersviolent␣presumptionviviparous␣eelpoutswin␣one␣for␣the␣Gipperwon␣one␣for␣the␣Gipper

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