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There are 141 eighteen-letter words containing 2I, 2O and 2U

accumulation␣pointsantiimmunoglobulinargilloferruginousautoagglutinationsautobioluminescentautocitrullinationautodeubiquinationautoimmunostainersautomotive␣industryautosuggestionistsautotransfusionistautoubiquitinationautoubiquitylationbiodesulfurizationbituminosulfonatesblood␣substitutionsbowmouth␣guitarfishBrillouin␣functionsburrowing␣junctionsbuttoning␣up␣one's␣lipcalcareobituminouschlorosulfuric␣acidcircumlocutionallycircumlocutionistscomputer␣simulationconductive␣couplingconfuciusornithidscontinuous␣deliverycontinuous␣functioncontinuous␣variablecorrugator␣cutis␣anicounterstimulationCusick's␣biscuitrootdéviation␣conjuguéediazonium␣compoundsdispute␣resolutionsdouble␣articulationdouble␣first␣cousinsequinoctial␣coluresflourodeoxyuridinefluorodeoxyuridinefluoroimmunometricGlorious␣Revolutionhypoubiquitinationignotum␣per␣ignotiusimmunoconjugationsimmunodistributionimmunodoublestainsimmunodysfunctionsimmunofluorimetricimmunofluorometricimmunoglobulinemiaimmunoluminometricimmunomanipulationimmunopurificationimmunostimulationsimmunosuppressionsinclusion␣compoundsinclusion␣functionsindolylglucuronideinferior␣colliculusinput-output␣sectionintestinocutaneousiron-sulfur␣proteinsiron-sulphur␣proteinleucoagglutinationlogical␣punctuationluminoimmunoassaysluminosity␣functionlumpenbourgeoisiesmalfunction␣routinemicrohistoculturesmicroneurosurgicalMitsunobu␣reactionsmonoubiquitinatingmonoubiquitinationmonoubiquitylatingmonoubiquitylationMountain␣View␣Countymultibiofunctionalmulticonfigurationmultineurotrophinsmutual␣informationsmutual␣organizationneighbouring␣groupsneomuscularizationneuroimmunologicalneuroimmunologistsneuroimmunopeptideneuroreductionismsneuroreductionistsnonbioaccumulativeoecumenical␣council œcumenical␣councilŌkuninushi-no-mikotooligoubiquitinatedorthosubstitutionsphilosophunculistsphotosubstitutionspilosebaceous␣unitspolyubiquitinationpolyubiquitylationPortuguesificationpronunciation␣guidepseudoarticulationpseudofolliculitispseudoguaianolidespseudoinstructionspseudojournalisticpseudolongitudinalpseudouridylationsquattuordecillionsreligious␣educationRepublic␣of␣Djiboutishoving␣it␣up␣your␣asssilicotuberculosissilicotuberculoticsodiumthiosulphate sodium␣thiosulphatesolubility␣productsspurious␣diphthongsspurious␣infectionsSturm-Liouville␣formsucking␣the␣air␣out␣ofsulfidoleukotrienesupercolumniationssuperior␣colliculussupposititiousnessultraconscientiousultrarevolutionismultrarevolutionistunconstitutionallyunilineal␣evolutionunilinear␣evolutionUnion␣of␣South␣Africaustilaginomycetousvaluation␣functionsviolaceous␣euphoniavirtual␣consumptionviviparous␣eelpoutswukipolyomaviruses

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