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

(page 6)

spelaeogriphaceanssphingoglycolipidssphingophosphatidespinous␣spider␣crabsspirocycloheptanesspirocyclopentanesspirocyclopropanesspiroplectamminidssplit-complex␣numbersplit␣personalitiesspondylodysplasticspondyloepiphysealspondyloperipheralspondylotherapistsspongiotrophoblastSportsman's␣Paradisespot-billed␣pelicansSprengel␣explosivesspurious␣diphthongsState␣of␣Mississippistereophotographicstop-and-go␣penaltiesstopping␣the␣pressesstraight␣apostrophestriped␣swampdragonsubpostmastershipssubspace␣topologiessulfoglycopeptidessulfoniopropionatesupercompensationssupercomputationalsuperexponentiallysupergiant␣amphipodsuperimpregnationssuperiority␣complexsupermicrocomputersuperminicomputerssupernova␣impostorssuperoleophobicitysuperpersonalitiessuperphenomenalitysuperphysiologicalsuperpositionalitysuperprofessionalssuperproficienciessupersophisticatedsupposititiousnesssuppressive␣personssupraphysiologicalSussex␣pond␣puddingssympathetic␣powderssymplectomorphismssymproportionationtechnophilosophiestenoepiphysiodesistephrostratigraphytertiary␣phosphinestetrakisphosphatestetrathiophosphatetetratricopeptidestheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthird-person␣pluralsthromboprophylaxisthrombosuppressionthrombosuppressivetin-pot␣dictatorshiptopside␣developmenttranspolyisoprenestranspyloric␣planestrialkylphosphinestricresyl␣phosphatetriisopropylsilanetrimethylphosphinetriphenylphosphanetriphenylphosphatetriphenylphosphinetriphosphoric␣acidstriphosphorylationtrivinylphosphinestropical␣depressiontrypanosusceptibletryptophylquinonesturpentine␣of␣Cyprustype␣introspectionsunwhipped␣of␣justiceupdating␣one's␣priorsUpper␣Assam␣Divisionureteropyeloscopicvertical␣apostrophevery␣special␣episodevideo␣photographersVietnam␣People's␣Armyvinylcyclopropanesviolent␣presumptionviviparous␣eelpoutswoodchip␣wallpapersyellow␣lady's␣slipperzoosporangiophores

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