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There are 896 eighteen-letter words containing I, 2O, P and 2R

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nonphotorefractivenonprocrastinatingnonproportionalitynonreproducibilitynontranscriptionalno␣prize␣for␣guessingnorbinaltorphiminenormoprolactinemicnorsesquiterpenoidnotoryctemorphiansnucleoriboproteinsoccipitotransverseoctabromoporphyrinoestroprogestativeOld␣World␣porcupinesoligohypomenorrheaoligoteratospermiaoperating␣room␣tableoperations␣managersoperations␣researchopposition␣researchorange-winged␣parrotorders␣of␣operationsorganolithotrophicorganotherapeuticsoriental␣pratincoleornithocheiromorphornithogeographersorthopediatriciansorthopedic␣surgeonsorthophasmavirusesorthopneumovirusesorthopsychiatristsorthotypographicalostarioclupeomorphosteoarthropathiesosteoproliferationosteoproliferativeotoneuroprotectiveouter␣automorphismsout␣of␣all␣proportionoverapproximations over-approximationsoverchoreographingoverextrapolationsoverinterpretationoverpressurisationoverpressurizationoverpronounciationoverproportionallyoverprotectivenessoverrepresentationoverresponsivenessoviraptorosauriansowners␣corporationspalaeohydrographicpaleobiogeographerpalmar␣fibromatosispaper␣scissors␣stonepapilioerythrinoneparabariomicroliteparabolic␣reflectorparades␣of␣horriblesparaprofessionallyparaterraformationparathyroid␣hormonePareto␣distributionPareto-improvements Pareto␣improvementsParkinson's␣syndromeParmigiano-Reggianoparticoloured␣bearspattern␣recognitionpedophilic␣disorderPembroke␣Welsh␣corgipepsinhydrochloricperfluoroarylationperfluorochemicalsperfoliate␣bellwortPermocarboniferous Permo-Carboniferouspersonal␣organizerspersonal␣propertiesperturbation␣theoryPeterson's␣algorithmpetro-dictatorshipspharmacobehavioralpharmacoinformaticpharmacophoricallypharmacoprotectivepharmacoproteomicsphilosophers␣by␣firephilosophers␣of␣firephonocardiographicphonomicrosurgicalphosphogartrellitephosphoriboproteinphosphorrössleritephosphorus␣necrosisphosphorylceramidephosphorylcreatinephosphotransmitterphosphotriesterasephotochronographicphotodeteriorationphotoferroelectricphotofluorographicphotographic␣artistphotographic␣memoryphotographic␣papersphotoheterotrophicphotoincorporationphotolithographersphotomicrographersphotomicrographingphotoorganotrophicphotoperturbationsphotoregenerationsphotoreproductionsphotorespirometersphotoreversibilityphotospectrometricphrasal␣prepositionphthirapterologistphycoerythrobilinsphycoerythrocyaninphylotranscriptomepicornavirologistspicroindigocarminepiezoaccelerometerpin␣a␣rose␣on␣your␣nosepiperonylonitrilespiriformis␣syndromeplagiogravitropismpleuroperipneumonyPlücker␣coordinatesPoincaré␣conjecturepolarization␣vectorpolitical␣correctorpolitically␣correctpolitical␣prisonerspolyacrylonitrilespolygon-circle␣graphpolymicrobacterialpoor␣little␣rich␣girlporphyrinogenicityporprismacoviruses

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