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There are 73 eighteen-letter words containing I, O, 2R, S and X

arylhydroxylaminesBhartrhari's␣paradoxbishydroxycoumarincarboxyfluoresceincarboxyfluorosceincigar␣box␣guitaristsconsumer␣price␣indexcontrol␣experimentscopy-on-write␣proxiescounterorthodoxiesdeoxyribofuranosesdextrocycloversiondihydroxyacridinesdihydroxyanthronesdragline␣excavatorselectroauxiliariesentorhinal␣cortexesexecutive␣producersexecutorial␣trusteeexecutory␣interestsexterosensorimotorextraneous␣variablefixed-term␣contractsflexor␣carpi␣ulnarisgross␣receipts␣taxeshexachloroiridateshexakistetrahedronhydroperoxidationshydroperoxyflavinshydroperoxylationshydrostatic␣paradoxhydroxycarotenoidshydroxyderivativeshydroxykynurenineshydroxyperoxidaseshydroxypiperidineshydroxypyrimidineshydroxystearic␣acidhydroxytryptamineshyperthyroxinemiasmetalexicographersMissouri␣Fox␣TrottermonohydroperoxidesMorris␣the␣Explainerneurosporaxanthinenorthward␣equinoxesOriental␣Orthodoxesoverapproximations over-approximationsoverextrapolationsProxima␣Centauriansproximoposteriorlyregular␣expressionsruns␣for␣the␣exercisescimitar-horned␣oryxsexual␣intercoursessexual␣reproductionSiebenbürger␣Saxonssulfur␣hexafluoridesuperextraordinarysuperiority␣complextetrakishexahedron tetrakis␣hexahedrontext␣door␣neighboursthromboprophylaxistranscarboxylationtransition␣matrixestricarboxylic␣acidstrihexosylceramidetrihydroxybenzenestrihydroxystilbenexerothermic␣periodsX-ray␣absorbing␣glass

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