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There are 937 eighteen-letter words containing I, O, R, 2S and 2T

(page 5)

predestinationistsPremonstratensianspreprosomatostatinpretermitted␣spousepretribulationistsprinter's␣apostropheprognostificationsproposition␣nationspropriosensitivityprosecution␣historyprotease␣inhibitorsprotoconversationsprotodesilylationsprotoplanetesimalsprotopsychologistsProto-South␣Sulawesipseudoaristocraticpseudoinstructionspseudointeractionspseudointersectionpseudomenstruationpseudomilitaristicpseudoobstructionspseudopterostigmaspseudorthoceratidspseudotrajectoriespseudotransductionpseudotrichonotidspsychotherapeuticspsychotherapeutistpsychrosensitivityput␣hair␣on␣one's␣chestput␣out␣of␣one's␣miseryput␣through␣its␣pacesquasidistributionsquasi-stellar␣objectradiosensitisationradiosensitivitiesradiosensitizationradiospectrometersradiosterilisationradiotelegraphistsradiotherapeutistsrecapitulationistsrecess␣appointmentsreconstructionismsreconstructionistsreconstructivenessrecrystallisationsrecrystallizationsrectal␣varicositiesredistributionistsregioselectivitiesrehabilitationistsrehospitalisationsrehospitalizationsreinstitutionalisereinstrumentationsreintensificationsrelative␣atomic␣massrematerialisationsrenationalisationsreparametrisationsrepresentationistsrepresentationlessreproductive␣systemrespiratory␣systemsrestandardizationsrestorative␣justicerestriction␣enzymesrestructurisationsrestructurizationsresupplementationsresurrection␣plantsreticulofenestridsretransfigurationsretransliterationsretransplantationsretrodisplacementsretrotranscriptaseretrotranspositionrevolutionisationsrhinoseptoplastiesrootinest␣tootinest rootin'est␣tootin'estroyal␣straight␣flushrubs␣salt␣in␣the␣woundsaber-toothed␣tigerssabre-toothed␣tigersSaint␣Anthony's␣crosssaturated␣solutionssaturation␣currentssaurornitholestineSchensted␣algorithmSchensted␣insertionSchrodinger␣kittens Schdinger␣kittensSchrodinger's␣kitten Schdinger's␣kittenScottish␣Deerhoundsscratch␣one's␣own␣itchscreening␣constantssculptured␣tortoiseSecretaries␣of␣Stateself-certificationsself-contradictionsself-fertilizationssemidirect␣productssemidiscretisationsemidiscretizationsemisymmetrizationseparation␣constantseparation␣of␣dutiesseptorhinoplastiesserodeterminationsseroneutralisationsets␣the␣world␣on␣fireset␣the␣Thames␣on␣firesexual␣orientationsshortcrust␣pastriesshort␣end␣of␣the␣stickshort-tailed␣parrotsshort-tailed␣weaselssialotranscriptomeSiberian␣stonechatssignal-to-noise␣ratiosignal␣transductionsimsun␣permutationssix␣bob␣a␣day␣touristsslapping␣on␣the␣wristslaty␣bristlefrontssmall␣tortoiseshellsmokestack␣industrysociomaterialitiessoftware␣architectssolubility␣productssomatomammotropinssomatosensorimotorSotteville-lès-RouenSouth␣Staffordshiresowing␣dragon's␣teethspectroastrometric

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