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There are 641 eighteen-letter words containing I, O, 2P, R and S

(page 4)

proteocephalideansproteolipoproteinsProto-Indo-Europeansprotoplanetary␣discprotoplanetary␣diskprotoplanetesimalsprotopsychologicalprotopsychologistsprototype␣extensionproverbs␣run␣in␣pairsprovincial␣capitalsproximoposteriorlypseudobiographicalpseudodiphtheriticpseudohyperkalemiapseudohypertensionpseudohypertrophicpseudohyponatremiapseudoimprovementspseudoparaphylliumpseudo-participialspseudopelletierinepseudophilosopherspseudophotographicpseudopornographicpseudoprofessional pseudo-professionalpseudoprogressivespseudoprotodioscinpseudopterostigmaspseudoreplicationspseudo-scholarshipspseudoxyrhophiinespseudozygopleuridspsychic␣photographypsychobiographicalpsychogeographicalpsychographologistpsychopharmaceuticpsychoprophylacticpsychotherapeuticspsychotherapeutistPuretic␣power␣blockspurple␣loosestrifesput␣through␣its␣pacespyrimidodiazepinespyrophosphokinasespyrophosphoramidespyrophosphoric␣acidpyrophosphorolysispyrophosphorolyticpyrophosphorylysispyrophosphorylyticpyropoikilocytosisPythagorean␣triplesread-eval-print␣loopsrecess␣appointmentsreciprocal␣pronounsrephosphorylationsrespiratory␣pigmentrespondeat␣superiorresumptive␣pronounsresupplementationsreverse-pickpockets reverse␣pickpocketsrhinoseptoplastiesrockhopper␣penguinssalpingooophoritis salpingo-oophoritissalpingopharyngealsalpingopharyngeusSanfilippo␣syndromeSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescissors␣paper␣stoneScopinaro␣proceduresecondary␣phosphineself-preoccupationssemiphosphorescentseparation␣of␣powersseptorhinoplastiessharp-tailed␣sparrowshipping␣containerssince␣Hector␣was␣a␣pupslapping␣on␣the␣wristsnapped␣one's␣fingerssocial␣partnershipssole␣proprietorshipsolitary␣sandpiperssomatoparaphreniassonosalpingographysonospectrographicSophie␣Germain␣primesopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspecial␣linear␣groupspecial␣proceedingsspecial␣prosecutorsspecial␣rapporteursspectrobolographicspectrodichrographspectrographicallyspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromicroscopicspectrophotometricspectropolarimeterspectropolarimetryspectropolariscopespelaeogriphaceansspinous␣spider␣crabsspirocycloheptanesspirocyclopentanesspirocyclopropanesspiroplectamminidssplit-complex␣numbersplit␣personalitiesspondyloperipheralspondylotherapistsspongiotrophoblastSportsman's␣ParadiseSprengel␣explosivesspurious␣diphthongsstereophotographicstopping␣the␣pressesstraight␣apostrophestriped␣swampdragonsubpostmastershipssulfoniopropionatesupercompensationssupercomputationalsuperexponentiallysupergiant␣amphipodsuperimpregnationssuperiority␣complexsupermicrocomputersuperminicomputerssupernova␣impostorssuperoleophobicitysuperpersonalitiessuperphenomenalitysuperphysiologicalsuperpositionality

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