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There are 116 fifteen-letter words containing I, O, 3S and 2U

ambiguousnessesannulus␣fibrosusassumptiousnessaudaciousnessesaudiovisualistsauthority␣issuesautosuggestions auto-suggestionsbituminous␣sandsbrachiosaurusesbrushtail␣possumbulbospongiosusbumptiousnessesburglariousnessconcussion␣fusesconspicuousnessconus␣arteriosuscosubstitutionscounterfissuresdisubstitutionsduplicitousnessfull␣disclosuresfusiform␣gyrusesillustriousnessimmunosupressorimpecuniousnessincongruousnessincredulousnessindustriousnessingenuousnessesinjudiciousnessinjuriousnessesinnocuousnessesintussusceptionIrish␣clubhousesisopullulanasesjusqu'auboutistsLissajous␣curvesLissajous␣figureludicrousnessesluxuriousnessesmellifluousnessMissouri␣Suckersmountainousnessnecessitudinousnonuniquenessesnulliparousnessovercuriousnesspercussion␣fusesperspicuousnessPolybius␣squaresprecautiousnesspromiscuousnesspseudoresidualspseudosolutionspunch-up␣sessionspunctiliousnesspurple␣of␣CassiusQuistclose␣trustresubstitutionsrisus␣sardonicusrumbustiousnessrussellosaurineRussian␣sturgeonsandwich␣sudokusscrumptiousnesssemiconspicuoussemicrustaceoussemiperspicuousserosanguineoussesquiple␣cousinshe's␣unconscioussodium␣sulphitessoup-and-fish␣suitSouth␣Caucasiansstaurikosauridsstratum␣spinosumsubconstituentssubcuratorshipssubdistributorssubinstructionssubitaneousnesssub-superstitionsuicide␣touristssulfoquinovosessulfosuccinatessuperdiffusionssuperinsulatorssuperperfusionssuperstitiouslysuperstructionssupersuspicioussurviving␣spousetoss-up␣questionsunambiguousnessunambitiousnessunconsciousnessuncustomarinessunfossiliferousuningenuousnessuninjuriousnessunjudiciousnessunlaboriousnessunmelodiousnessunobtrusivenessunofficiousnessunreligiousnessunrighteousnessunselfconscious unself-consciousunsubscriptionsunsuperstitiousuprighteousnessvesiculovirusesvicissitudinousvirtual␣focusses

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