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There are 354 eighteen-letter words containing I, 3O, P and 2R

(page 2)

microspectroscopesmicrospectroscopicmicrothermocouplesmicrotopographicalmicrowhip␣scorpionsmitochondriotropicmonohydroperoxidesmorphoelectrotonicmorphogeographicalmultiphotoreceptormyeloproliferationmyocardiodystrophynarrow-leaved␣poisonneoandrographolideneuroleptospirosisneuromorphogenesisneuromorphologicalneuromorphometricsneuropharmacologicneuroproliferationnonanthropomorphicnoncardiopulmonarynonchromatographicnonelectrophoreticnonhistoriographicnonphotorefractivenonproportionalitynormoprolactinemicnotoryctemorphiansnucleoriboproteinsoctabromoporphyrinoestroprogestativeOld␣World␣porcupinesoligohypomenorrheaoligoteratospermiaoperating␣room␣tableopposition␣researchorders␣of␣operationsorganolithotrophicornithocheiromorphornithogeographersorthopedic␣surgeonsorthopneumovirusesorthotypographicalostarioclupeomorphosteoarthropathiesosteoproliferationosteoproliferativeotoneuroprotectiveouter␣automorphismsout␣of␣all␣proportionoverapproximations over-approximationsoverchoreographingoverextrapolationsoverpronounciationoverproportionallyoviraptorosauriansowners␣corporationspaleobiogeographerparathyroid␣hormoneperfluoroarylationPermocarboniferous Permo-Carboniferouspharmacoproteomicsphilosophers␣of␣firephonocardiographicphonomicrosurgicalphosphoriboproteinphosphorrössleritephosphorus␣necrosisphotochronographicphotodeteriorationphotoferroelectricphotofluorographicphotographic␣memoryphotoheterotrophicphotoincorporationphotolithographersphotomicrographersphotomicrographingphotoorganotrophicphotoperturbationsphotoregenerationsphotoreproductionsphotorespirometersphotospectrometricpicornavirologistspin␣a␣rose␣on␣your␣nosepolarization␣vectorpolitical␣correctorportoenterostomiespostbronchodilatorposterior␣malleolusposterodorsomedialposterodorsomedianpost␣mortem␣auctorispostorbitofrontalspostpericardiotomypostrepolarizationpour␣honey␣in␣one's␣earpouring␣cold␣water␣onpower␣of␣terminationpreoligodendrocyteprephosphorylationpreprosomatostatinproapolipoproteinsproatherosclerosisproatheroscleroticprobationary␣periodprocardiomyopathicprofessional␣sportsprolonged␣abortionspromorphologicallypropiomelanocortinpropionylpromasineproportionablenessproportionlessnessproposition␣playersprosecution␣historyprosopographicallyprosperity␣theologyprostereoisomerismproteochemometricsproteolipoproteinsprothoracicotropicprotochlorophilideprotocoligoricallyprotoconversationsprotocycloceratidsprotodeboronationsProto-Indo-Europeansprotomicrocotylidsprotomitochondrialprotomitochondrionprotomyofibroblastprotoporphyrinogenproximoposteriorlypseudocorrelationspseudoorthorhombicpseudopornographicpteromerhanophobiapyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylysispyrophosphorylyticpyrrolidinophenoneradiochromatographradioimmunoprotein

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