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There are 687 eighteen-letter words containing I, N, O, P, 2R and S

(page 4)

preadministrationsprecrystallizationpreinterpretationsPremonstratensiansprephosphorylatingprephosphorylationprepositional␣verbspreprofessionalismpreprosomatostatinprescription␣bottlepresenting␣problemspresent␣progressiveprestandardizationpresynchronizationpretranscriptionalpretranslocationalpretransplantationpretribulationistsprevascularizationprice-earnings␣ratioprimary␣legislationprimitive␣recursionPrince␣of␣Wales␣spursPrince␣Rupert's␣dropsprinter's␣apostropheprisoner-of-war␣campsproapolipoproteinsprocedure␣divisionspro-circumcisionistproduction␣brigadesprofessional␣sportsprogressive␣dinnersprojection␣matricesproletarianisationprolonged␣abortionspropionylpromasineproportionablenessproportionlessnessproposition␣playersproprietary␣eponymspropriosensitivityproscenium␣curtainsprosecution␣historyprosperity␣doctrineprotease␣inhibitorsproteolipoproteinsprotoconversationsprotodeboronationsProto-Indo-Europeansprotoplanetary␣discprotoplanetary␣diskproverbs␣run␣in␣pairspro-vice-chancellorsProxima␣Centaurianspseudocorrelationspseudograndreefitepseudopornographicpsychogeriatricianpurulent␣bronchitisPyrénées-OrientalesPythagorean␣triplesradiation␣pressuresrained␣on␣one's␣paraderat␣printing␣officesRavensthorpe␣radishread-eval-print␣loopsRécamier's␣operationreciprocalizationsreciprocal␣pronounsreciprocitarianismrecircumscriptionsrecompartmentaliseregular␣expressionsreparameterisationreparametrisationsreparametrizationsrepersonalizationsrephosphorylationsrepresentationallyrepresentationistsrepresentationlessrepresentation␣termreprimitivizationsreproductive␣organsreprofessionalizedreprofessionalizesRepublic␣of␣Surinamereservoir␣computingrespiratory␣pigmentrespondeat␣superiorresponding␣variableresponsible␣tradingresumptive␣pronounsresurrection␣plantsretransplantationsretrodisplacementsretrophylogenomicsretrotranscriptaseretrotranscriptionretrotranscriptomeretrotranspositionrevising␣one's␣priorsrhinolaryngoscopesribonucleoproteinsrockhopper␣penguinsroentgenotherapistromantic␣friendshiprose-ringed␣parakeetRuffini's␣corpusclesRusso-European␣LaikasaccopharyngiformsSaharanpur␣Divisionscansoriopterigidsscansoriopterygidsscissors␣paper␣stonescleractiniamorphsScopinaro␣procedureseafloor␣spreadingssecondary␣predationSecond␣French␣Empireseismic␣performanceseismochronographssenior␣patrol␣leaderseparation␣energiesseparation␣of␣powerssexual␣reproductionsialotranscriptomesit-and-wait␣predatorsling␣psychrometerssnowdrop␣windflowersocial␣entrepreneursocial␣partnershipssolitary␣sandpiperssomatoparaphreniassonospectrographicSophie␣Germain␣primesopranino␣recorderssouthern␣hemisphere Southern␣Hemispherespanners␣in␣the␣worksspecial␣linear␣groupspectrogoniometers

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