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There are 3269 eighteen-letter words containing E, I, P and R

(page 14)

pericyclic␣reactionperiimplantationalperiinterventionalperimineralizationperiodic␣inequalityperiodic␣structuresperiodontopathogenperipancreatitidesperipheralizationsperitoneal␣dialysisperiurethral␣glandspermanent␣residencypermanent␣residentspermineralizationspermissionlessnessPermocarboniferous Permo-Carboniferouspernicious␣anaemias pernicious␣anæmiasperoxodiphosphatesperpendicularitiesperpetual␣inventorypersistence␣hunterspersistence␣huntingpersonal␣assistantspersonality␣clashespersonal␣lubricantspersonal␣organizerspersonal␣propertiesperspective␣glassesperspectivizationsperturbation␣theoryPeruvian␣chinchilasPeruvian␣chinchillaPeruvian␣Inca␣OrchidpescovegetarianismPeter␣Pan␣generationPeterson's␣algorithmpetite␣bourgeoisiespetro-dictatorshipsphacofragmentationphacoiridencleisisphaeosphaeriaceousphallologocentrismphanerocrystallinephantom␣pregnanciespharmaceuticalizedpharmacobehavioralpharmacoeconomicalpharmacoeconomistspharmacoepigeneticpharmacoepigenomespharmacogeneticistpharmacogenotypingpharmacokineticistpharmacomechanicalpharmacometricianspharmacopathogenicpharmacoprotectivepharmacoproteomicspharmacoresistancepharmacoresistancypharmacotherapistspharyngealizationspharyngoepiglotticpharyngointestinalpharyngolaryngitesphenanthraquinonesphenylboronic␣acidsphenylcarbamic␣acidphenylcarbodiimidephenylchlorosilanephenylenedicarbenePhiladelphia␣lawyerphilanthropreneursPhilippine␣ironwoodPhilippine␣tarsiersphiloprogenitivelyphilosophers␣by␣firephilosophers␣of␣firephilosopher's␣stones philosophers'␣stonesphosphatidylserinephosphodestructionphosphodiesterasesphosphofluoridatesphosphogartrellitephosphoisoprenoidsphospholipoproteinphosphorecognitionphosphoribomutasesphosphoriboproteinphosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothiolatedphosphorothiolatesphosphorrössleritephosphorus␣cachexiaphosphorus␣necrosisphosphorylceramidephosphorylcholinesphosphorylcreatinephosphosaccharidesphosphotransmitterphosphotriesterasephotic␣sneeze␣reflexphotoallergenicityphotocrosslinkablephotodecolourationphotodegradabilityphotodensitometersphotodensitometricphotodeteriorationphotodisintegratedphotodisintegratesphotodocumentariesphotoelectric␣cellsphotoelectroactivephotoelectromotivephotofermentationsphotoferroelectricphotofragmentationphotographic␣memoryphotographic␣papersphotographic␣platesphotoheterotrophicphotoimmunotherapyphotointermediatesphotoisomerisationphotoisomerizationphotokeratectomiesphotolithographersphotomicrographersphotomorphogenesisphotomorphogeneticphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotoperturbationsphotopiezoelectricphotopolymerizablephotoprecipitationphotorecombinationphotoregenerationsphotoreproductionsphotorespirometersphotoreversibilityphotospectrometric

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