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There are 3453 fifteen-letter words containing I, O, S and Y

(page 19)

thysanopteriststhysanoteuthidstime-consuminglyTimothy␣syndromeTomb-Sweeping␣Day Tomb␣Sweeping␣Daytorsadogenicitytosylazetidinestosylaziridinestosylchloramidetosylnucleosidetotally␣geodesictouchy-feelinesstouring␣bicyclestourist␣highwaystrachelostylidstrachydoleritestrachyuropodidstraffic␣advisorytransactionallytransactivatorytransacylationstransaorticallytranscorticallytransfusionallytranshemizygoustransitionalitytransition␣layertransition␣yearstranslationallytranslesionallytransmisogynist trans-misogynisttransmisogynoirtransmodiolarlytransmogrifyingtransmyocardialtransnationallytransphobicallytransposabilitytranspositivelytransrationallytransregionallytranssilylationtrebouxiophytestriactinomyxonstrialkoxysilanetricarboxylatestrichodactylidstrichodyschroiatrichodysplasiatrichomycteridstrichopterygidstrichostrongyletrichrysobactintricotyledonoustriethoxysilanetrifloxystrobintriglucosylatedtriglycosylatedtrimethylationstriple␣A␣syndrometriple␣X␣syndrometripropylaminestrithiocyanatestrolleyologiststrying␣on␣for␣sizetry␣one's␣patiencetrypanosomacidetrypanosomatidstrypanosomiasestrypanosomiasistrypanosomicidetrypomastigotestrypsinisationstrypsinizationsturkey␣droppingstwenty␣questionstwentysomething twenty-somethingTwin␣Falls␣CountytympanocentesistympanoplastiesTyndallizationstype␣collectionstype␣conversionstype-token␣ratiostyphlocolitidestyphloenteritistyrannosaurinestyrannosauroidsTyrode's␣solutionTyrrhenian␣molesultramicroscopyunapostolicallyunary␣operationsuncategorisablyuncensorabilityunceremoniouslyuncomplaisantlyunconsideringlyunconspicuouslyunconstrainedlyuncontentiouslyunderluminosityunderlying␣formsunflirtatiouslyunholy␣trinitiesunidiosyncraticunillustriouslyunimpassionedlyunindustriouslyunitary␣councilsunit␣gyrovectorsuniversity␣townsunmagnanimouslyunmeritoriouslyunmyristoylatedunnostalgicallyunobservabilityunobstructivelyunpatronisinglyunperspicuouslyunphysiologicalunpretentiouslyunprogressivelyunpsychologicalunquestioninglyunreasonabilityunrepetitiouslyunresolvabilityunrestorabilityunseasonabilityunsententiouslyunsophisticallyunstereotypicaluntrustworthilyurogynecologisturopygial␣glandsursodeoxycholicutility␣programsvagosympatheticvampire␣syndromevampyromorphidsvampyroteuthidsvasculotoxicityvasospasmolysisvasospasmolyticvasostimulatoryventriculocytesventriculostomyventriloquouslyvestibuloplastyvibroscopicallyVickrey␣auctionsvideodermoscopyvideomicroscopyVietnam␣syndromevinylcarbenoidsvinylphosphinesvinylporphyrinsviolinisticallyviscoamylographviscoamylolyticviscoelasticityviscometricallyviscoplasticityvisible␣minorityvisual␣proximityvivisectionallyvoyeuristicallywallemiomycetesWay␣of␣Saint␣Jameswhat's␣on␣your␣mindwhat's␣your␣poisonWhiteside␣CountyWhitney's␣theoremwild␣man␣syndrome

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