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There are 641 eighteen-letter words containing I, O, 2P, R and S

(page 5)

superprofessionalssuperproficienciessupersophisticatedsuppressive␣personssupraphysiologicalsympathetic␣powderssymplectomorphismssymproportionationtephrostratigraphytertiary␣phosphinestetrakisphosphatestetrathiophosphatetetratricopeptidestheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthird-person␣pluralsthromboprophylaxisthrombosuppressionthrombosuppressivetin-pot␣dictatorshiptranspolyisoprenestranspyloric␣planestrialkylphosphinestricresyl␣phosphatetriisopropylsilanetrimethylphosphinetriphenylphosphanetriphenylphosphatetriphenylphosphinetriphosphoric␣acidstriphosphorylationtrivinylphosphinestropical␣depressiontrypanosusceptibletryptophylquinonesturpentine␣of␣Cyprustype␣introspectionsupdating␣one's␣priorsUpper␣Assam␣Divisionureteropyeloscopicvertical␣apostrophevery␣special␣episodevideo␣photographersVietnam␣People's␣Armyvinylcyclopropanesviolent␣presumptionviviparous␣eelpoutswoodchip␣wallpapersyellow␣lady's␣slipperzoosporangiophores

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