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There are 720 eighteen-letter words containing I, 2O, 2R and 2T

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osteoproliferativeosteoradionecroticostrich␣instructionotoneuroprotectiveouter␣automorphismsout␣of␣all␣proportionovariohysterectomyoveradministrationovercategorizationovercentralisationovercentralizationoverdramatisationsoverdramatizationsoverextrapolationsoverinterpretationoverneutralizationoverprotectivenessoverrepresentationoverstratificationparaterraformationPareto␣distributionPareto-improvements Pareto␣improvementspattern␣recognitionperfoliate␣bellwortperturbation␣theoryPeterson's␣algorithmpetro-dictatorshipspharmacoprotectivephosphogartrellitephosphotransmitterphosphotriesterasephotodeteriorationphotoferroelectricphotographic␣artistphotoheterotrophicphotoincorporationphotolithographersphotoorganotrophicphotoperturbationsphotoregenerationsphotoreproductionsphotorespirometersphotoreversibilityphotospectrometricphthirapterologistphylotranscriptomepolarization␣vectorpolitical␣correctorpolitically␣correctpoor␣little␣rich␣girlportal␣hypertensionportoenterostomiespostbronchodilatorposteroventricularpost␣mortem␣auctorispostorbitofrontalspostpericardiotomypostranscriptionalpostrepolarizationpostresurrectionalpower␣of␣terminationpreached␣to␣the␣choirpreaches␣to␣the␣choirpreatheroscleroticpreprosomatostatinprescription␣bottlepretranslocationalprime␣factorizationprinter's␣apostropheproatheroscleroticprochaetodermatidsprodifferentiationprojection␣matricesprojective␣geometryproletarianisationproletarianizationpropriosensitivityprosecution␣historyprosperity␣doctrineprosperity␣theologyprotease␣inhibitorsprotective␣reactionproteochemometricsproteolipoproteinsprothoracicotropicprotoconversationsprotocycloceratidsprotodeboronationsprotomicrocotylidsprotomitochondrialprotomitochondrionprotomyofibroblastprotoplanetary␣discprotoplanetary␣diskpseudoaristocraticpseudorthoceratidspseudotrajectoriesradial␣keratotomiesradiation␣pyrometerradioconcentrationradiodensitometricradiodeterminationradiospectrometersradiospectrometricradiosterilisationradiosterilizationreconstructionismsreconstructionistsrefrigerator␣motherregistration␣countyrelational␣operatorreproblematizationrerationalizationsrestoration␣ecologyreticular␣formationretroaldolizationsretrocycloadditionretrodimerizationsretrotranscriptionretrotranscriptomeretrotranslocatingretrotranslocationretrotranspositionrhetorical␣questionrhizocompartmentalride␣the␣cotton␣horseright␣to␣be␣forgottenRobinson␣arithmeticroentgenotherapistroom-temperature␣IQs room␣temperature␣IQs room␣temperature␣I.Q.srostroventromedialrotational␣energiesrotational␣symmetrysaber-toothed␣tigerssabre-toothed␣tigerssaltwater␣crocodilesaurornitholestinesculptured␣tortoiseselenocentric␣orbitserodeterminationsseroneutralisationseroneutralizationservant␣out␣of␣liverysets␣the␣world␣on␣fire

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