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There are 837 eighteen-letter words containing E, H, I, 2O, P and R

(page 4)

oesophagobronchialofficers␣of␣the␣peaceoligodendropathiesoligohymenophoreanoligohypomenorrheaoligomeganephroniaoligoparaphenyleneon-the-fly␣encryptionoperations␣researchopisthobranchiatesopisthomonorchiineopposition␣researchorganotherapeuticsornithocheiromorphornithogeographersorthopediatriciansorthopedic␣surgeonsorthophasmavirusesorthopneic␣positionorthopneumovirusesostarioclupeomorphosteoarthropathiesosteochondropathiaosteomorphologicalouter␣automorphismsoveraccomplishmentoverchoreographingoverpsychologizingoversophisticationpalaeobiochemistrypalaeobiogeographypalaeoceanographicpalaeodemographiespalaeogeochemistrypalaeogeographicalpalaeohydrographicpalaeohydrologicalpalaeohydrologistspalaeontographicalpalaeopropithecidspalaeornithologistpaleobiogeographerpaleobiogeographicpaleochronologicalpaleodemographicalpaleoherpetologistpaleooceanographicpaleornithologicalpaleornithologistspaleotopographicalpanbiogeographicalpanhypoproteinemiapanhypoproteinemicpapilioerythrinoneparades␣of␣horriblesparapodiapophysealparathyroid␣hormonepathomorphogenesispedophilic␣disorderpellitory␣of␣the␣wallPembroke␣Welsh␣corgipennies␣on␣the␣dollarpentachloroanisolepepsinhydrochloricperfluorochemicalsperiodontopathogenperoxodiphosphatesperturbation␣theoryPeterson's␣algorithmpetro-dictatorshipsphacofragmentationphaeosphaeriaceousphallologocentrismpharmacobehavioralpharmacoeconomicalpharmacoeconomistspharmacoepigenomespharmacogenotypingpharmacopathogenicpharmacoprotectivepharmacoproteomicspharyngoepiglotticphenylboronic␣acidsphenylchlorosilanePhilippine␣ironwoodphiloprogenitivelyphilosophers␣by␣firephilosophers␣of␣firephilosopher's␣stones philosophers'␣stonesphosphodestructionphosphodiesterasesphosphofluoridatesphosphogartrellitephosphoisoprenoidsphospholipoproteinphosphorecognitionphosphoribomutasesphosphoriboproteinphosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothiolatedphosphorothiolatesphosphorrössleritephosphorus␣cachexiaphosphorus␣necrosisphosphorylceramidephosphorylcholinesphosphorylcreatinephosphosaccharidesphosphotransmitterphosphotriesterasephotoallergenicityphotocrosslinkablephotodecolourationphotodegradabilityphotodensitometersphotodensitometricphotodeteriorationphotodisintegratedphotodisintegratesphotodocumentariesphotoelectric␣cellsphotoelectroactivephotoelectromotivephotofermentationsphotoferroelectricphotofragmentationphotographic␣memoryphotographic␣papersphotographic␣platesphotoheterotrophicphotoimmunotherapyphotointermediatesphotoisomerisationphotoisomerizationphotokeratectomiesphotolithographersphotomicrographersphotomorphogenesisphotomorphogeneticphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotoperturbationsphotopiezoelectricphotopolymerizablephotoprecipitationphotorecombinationphotoregenerations

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