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There are 140 eighteen-letter words containing I, O, 2P and 3S

a␣promise␣is␣a␣promiseBaldwin's␣phosphorusbiometric␣passportscomparison␣shopperscorrespondentshipsdepressor␣septi␣nasieosinophilopoiesisEsopus␣Spitzenburgsfirst-person␣pluralshanging␣up␣one's␣spurshelping␣professionsHippocrates␣sleeves Hippocrates'␣sleevesHittorf's␣phosphorushyperesponsivenesshyporesponsivenessimmunosuppressantsimmunosuppressionsimmunosuppressivesimpersonal␣passivesJapanese␣persimmonskeep␣one's␣lips␣sealedkeeps␣it␣in␣one's␣pantskept␣one's␣lips␣sealedlongspine␣snipefishloose␣lips␣sink␣shipslysophosphatidateslysophospholipasesmapping␣class␣groupsmicrospectroscopesmonophosphokinasesneuroleptospirosisnonsuppressibilityOmphalos␣hypothesisopportunity␣classesOppression␣Olympicsopsonophagocytosisoutside␣passed␣pawnspaedopsychologistspaper␣scissors␣stonePatagonia␣cypressespathophysiologistspaying␣one's␣respectspayload␣specialistspentakisphosphatesphilosopher's␣stones philosophers'␣stonesphilosophunculistsphosphodiesterasesphosphoisoprenoidsphosphonucleosidesphosphoribomutasesphosphorrössleritephosphorus␣necrosisphosphosaccharidesphosphosensitivityphosphotriesterasephysiopathogenesisphysiopathologistspolydispersivitiespolysomnographistsporprismacovirusespossessive␣pronounspostconceptualistspost-impressionismspostimpressionistspotassium␣feldsparsPowerPointlessnessprepositional␣casespreprofessionalismpresent␣progressivepresuppositionlessPrince␣of␣Wales␣spursprismatic␣compassesprofessional␣sportsprogressive␣suppersprogressive␣web␣appsProgress␣Pride␣flagsproportionlessnessprotopsychologistspseudophacodonesispseudophakodonesispseudophilosopherspseudophilosophiespseudoprofessional pseudo-professionalpseudoprogressivespseudopsychologiespseudopterostigmaspseudo-scholarshipspsychological␣slipspsychopathologistspsychophilosophiespsychophysiologistpulling␣one's␣socks␣uppulling␣up␣one's␣sockspurple␣loosestrifespyrophosphokinasespyrophosphorolysispyrophosphorylysisqueen's␣bishop's␣pawnsrecess␣appointmentsrhinoseptoplastiesscissors␣paper␣stonesemiphosphorescentseptorhinoplastiessnapped␣one's␣fingerssocial␣partnershipssolitary␣sandpiperssoprano␣saxophonistsoprillo␣saxophonesspecial␣prosecutorsspectrohelioscopesspeech␣pathologistsspinous␣spider␣crabssplit␣personalitiesspondylodysplasticspondylotherapistsSportsman's␣ParadiseSprengel␣explosivesspurious␣diphthongsState␣of␣Mississippistopping␣the␣pressessubpostmastershipssubspace␣topologiessupercompensationssupernova␣impostorssuperpersonalitiessuperprofessionalssupersophisticatedsupposititiousnesssuppressive␣personsSussex␣pond␣puddingssymplectomorphismstenoepiphysiodesistetrakisphosphatesthrombosuppressionthrombosuppressivetranspolyisoprenesUpper␣Assam␣Division

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