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There are 542 eighteen-letter words containing 2I, O, P, R and 2S

(page 3)

philosophers␣of␣firephloroglucinolysisphosphatidylserinephosphoisoprenoidsphotocrosslinkingsphotodisintegratesphotoisomerisationphrasal␣prepositionphysiobiochemistrypick␣someone's␣brainspicornavirologistspiezoimmunosensorspiezoresistivitiespiriformis␣syndromepiscirickettsiosispiss␣like␣a␣racehorseplanning␣permissionpolice␣commissionerpolitical␣commissarpolitical␣prisonerspolitical␣spectrumspolydispersibilitypolydispersivitiespoor␣is␣a␣state␣of␣mindporprismacovirusesposition␣of␣strengthpositive␣neutralismpositive␣transitionpostadministrationpostbehavioralistspost-impressionismspostimpressionistspostmillenarianismpostprecipitationspostquestionnairespostranscriptionalpoststratificationposttribulationismposttribulationistpotassium␣hydroxidepragmatic␣sanctionspreadministrationspreassociativenesspredestinationistspredispositionallyprepositional␣casesprepositional␣verbspreprofessionalismPresidency␣divisionpresuppositionallypresuppositionlesspretribulationistsprismatic␣compassesprocedure␣divisionsprocessus␣mastoideiprocess␣window␣indexpro-circumcisionistprofessional␣victimprognostificationsprogressive␣dinnersproposition␣nationsproposition␣playerspropriosensitivityproscenium␣curtainsprosecution␣historyprostereoisomerismprotease␣inhibitorsprotodesilylationsproverbs␣run␣in␣pairsprovincialisationsprovisional␣licensepseudoaristocraticpseudoconformitiespseudodisaccharidepseudoinstructionspseudointeractionspseudointersectionpseudoisochromaticpseudojournalisticpseudomilitaristicpseudo-participialspseudoprotodioscinpseudoreplicationspseudotrichonotidspseudouridylationspseudoxyrhophiinespsychohistoricallypsychrosensitivitypulling␣in␣one's␣hornspyropoikilocytosisquasiperiodicitiesquasiprobabilities quasi-probabilitiesradiation␣pressuresradiotelegraphistsradiotherapeutistsrecapitulationistsrecircumscriptionsrectosigmoidoscopyregiospecificitiesrehospitalisationsrehospitalizationsrejection␣samplingsreligious␣pluralismreparametrisationsrepersonalizationsrepresentationistsreprofessionalizedreprofessionalizesresponsibilisationresponsibilizationresponsible␣tradingretrotranspositionreverse␣implied␣oddsrevising␣one's␣priorsrhinoseptoplastiesRuffini's␣corpusclesSaffir-Simpson␣scaleSaharanpur␣Divisionsalpingooophoritis salpingo-oophoritisSanfilippo␣syndromescansoriopterigidsscansoriopterygidsSchopenhauerianismscientific␣problemsscleractiniamorphsseismic␣lithosphereseismic␣performanceseismocardiographysemidirect␣productssemiprofessionallyseparation␣energiesseparation␣of␣dutiesseptorhinoplastiesshipping␣containersshoving␣it␣up␣your␣asssialoglycoproteinssialotranscriptomesimsun␣permutationsSingaporean␣Englishslapping␣on␣the␣wristsocial␣partnershipssolenofilomorphidssole␣proprietorshipsolitary␣sandpipers

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