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There are 407 eighteen-letter words containing I, O, 2P and 2S

(page 3)

put␣through␣its␣pacespyrophosphokinasespyrophosphoramidespyrophosphorolysispyrophosphorylysispyropoikilocytosisqueen's␣bishop's␣pawnsrecess␣appointmentsrephosphorylationsrespondeat␣superiorresumptive␣pronounsresupplementationsreverse-pickpockets reverse␣pickpocketsrhinoseptoplastiessalpingooophoritis salpingo-oophoritissalpingopharyngeussalpingoscopicallySanfilippo␣syndromescissors␣paper␣stonesecondary␣phosphineself-preoccupationssemiphosphorescentseparation␣of␣powersseptorhinoplastiessesquipedalophobiasharp-tailed␣sparrowshipping␣containerssialoglycopeptidessince␣Hector␣was␣a␣pupslapping␣on␣the␣wristsnapped␣one's␣fingerssocial␣partnershipssociophilosophicalsole␣proprietorshipsolitary␣sandpiperssomatoparaphreniassonosalpingographysonospectrographicsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspecial␣proceedingsspecial␣prosecutorsspecial␣rapporteursspectroheliographsspectrohelioscopesspectrohelioscopicspectromicroscopicspectropolariscopespeech␣pathologistsspelaeogriphaceanssphingoglycolipidssphingophosphatidespinous␣spider␣crabsspirocycloheptanesspirocyclopentanesspirocyclopropanesspiroplectamminidssplit␣personalitiesspondylodysplasticspondyloepiphysealspondylotherapistsspongiotrophoblastSportsman's␣Paradisespot-billed␣pelicansSprengel␣explosivesspurious␣diphthongsState␣of␣Mississippistop-and-go␣penaltiesstopping␣the␣pressesstraight␣apostrophestriped␣swampdragonsubpostmastershipssubspace␣topologiessulfoglycopeptidessupercompensationssuperimpregnationssuperminicomputerssupernova␣impostorssuperpersonalitiessuperphysiologicalsuperpositionalitysuperprofessionalssuperproficienciessupersophisticatedsupposititiousnesssuppressive␣personssupraphysiologicalSussex␣pond␣puddingssympathetic␣powderssymplectomorphismstechnophilosophiestenoepiphysiodesistertiary␣phosphinestetrakisphosphatesthiopyrophosphatesthird-person␣pluralsthrombosuppressionthrombosuppressivetranspolyisoprenestranspyloric␣planestrialkylphosphinestricresyl␣phosphatetriisopropylsilanetriphosphoric␣acidstrivinylphosphinestropical␣depressiontrypanosusceptibletype␣introspectionsupdating␣one's␣priorsUpper␣Assam␣Divisionvery␣special␣episodeviviparous␣eelpoutsyellow␣lady's␣slipperzoosporangiophores

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