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There are 937 eighteen-letter words containing I, 2O, P and 2S

(page 6)

repersonalizationsrephosphorylationsreprofessionalizedreprofessionalizesrespondeat␣superiorresponsibilisationresponsibilizationresumptive␣pronounsretrotranspositionrevising␣one's␣priorsrhinolaryngoscopesrhinoseptoplastiesRusso-European␣Laikasaccopharyngiformssafety-deposit␣boxessalpingooophoritis salpingo-oophoritissalpingoscopicallySanfilippo␣syndromesarcoendoplasmaticscansoriopterigidsscansoriopterygidsschool␣psychologistscissors␣paper␣stonescoped␣enumerationssculptured␣tortoiseseafloor␣spreadingsseasonal␣depressionsecondary␣phosphineseismocardiographyseismochronographsself-preoccupationssemiphosphorescentsemiprofessionallysend␣someone␣packingsent␣someone␣packingseparation␣constantseparation␣of␣dutiesseparation␣of␣powersseptorhinoplastiessesquipedalophobiaset␣up␣someone's␣birseShakespearologistsshort-tailed␣parrotsshotgun␣microphonesshoving␣it␣up␣your␣asssialoglycopeptidessialoglycopolymerssialoglycoproteasesialoglycoproteinssialotranscriptomeskotomorphogenesissocial␣psychologiessociophilosophicalsociopsychologicalsociopsychologistssodiumthiosulphate sodium␣thiosulphatesolenofilomorphidssole␣proprietorshipsolubility␣productssomaticosplanchnicsomatomammotropinssomatoparaphreniassonosalpingographysonospectrographicsopranino␣recorderssopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonessourtop␣blueberriesspaghetti␣bolognesespecial␣prosecutorsspecial␣resolutionsspectroastrometricspectrogoniometersspectroheliographsspectrohelioscopesspectrohelioscopicspectromicroscopicspectropolariscopespectroradiometersspeech␣pathologistssphingoglycolipidssphingophosphatidespiked␣someone's␣gunsspikes␣someone's␣gunsspirits␣of␣hartshornspirocycloheptanesspirocyclopentanesspirocyclopropanesspiroketalizationsspit␣in␣someone's␣facesplit-ring␣resonatorspoil␣someone␣rottenspondylodysplasticspondyloepiphysealspondylotherapistsspongiotrophoblastspontaneous␣fissionSpotsylvania␣Countyspurious␣diphthongsspurious␣infectionsstaphylinidologiststereofluoroscopicSterling␣professorsstop-and-go␣penaltiesstorage␣hypervisorsstraight␣apostrophesubcompositionallysubmicroscopicallysubpsychotomimeticsubspace␣topologiessuccinylproteomicssudoriparous␣glandssuffer␣by␣comparisonsulfoglycopeptidessupercolumniationssupercommunicatorssupercompensationssupercondensationssuperconsciousness super-consciousnesssuperferociousnesssuperior␣colliculussupernova␣impostorssuperphysiologicalsuperpositionalitysuperprofessionalssuperstoichiometrysupposititiousnesssupraconsciousnesssupraorganizationssupraphysiologicalsuspension␣syndromeswears␣like␣a␣troopersymbolic␣expressionsympathoinhibitorssymplectomorphismssynchiotrophoblastsynctiotrophoblasttachistoscopicallytakes␣it␣upon␣oneselfTaylor's␣polynomialsTaylor-White␣process

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