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There are 1826 eighteen-letter words containing I, O, P, R, S and T

(page 11)

security␣proceduresseismic␣lithosphereself-preoccupationssemidirect␣productssemiphosphorescentsenior␣patrol␣leaderseparable␣extensionseparation␣constantseparation␣energiesseparation␣of␣dutiesseparation␣of␣powersSeptember␣equinoxesseptorhinoplastiesseroepizootiologicset␣up␣someone's␣birsesexual␣reproductionShakespearologistssharp-tailed␣sparrowshipping␣containersshit␣or␣get␣off␣the␣potshooting␣from␣the␣hipshooting␣from␣the␣lipshortcrust␣pastriesshort-tailed␣parrotsshotgun␣microphonesshoving␣it␣up␣your␣asssialoglycoproteasesialoglycoproteinssialoglycoproteomesialotranscriptomesialylglycoproteinsimsun␣permutationssince␣Hector␣was␣a␣pupSingaporeanizationsit-and-wait␣predatorskotomorphogenesisslapping␣on␣the␣wristsleeping␣dictionarysling␣psychrometerssocial␣anthropologysocial␣entrepreneursocial␣partnershipssociopragmaticallysodium␣hypochloritesole␣proprietorshipsolitary␣sandpiperssolubility␣productssomatograviceptivesomatomammotropinssomatoparaphreniassonospectrographicsoprano␣saxophonistsourtop␣blueberriessouthern␣hemisphere Southern␣Hemispheresouthern␣yellow␣pinespanners␣in␣the␣worksspecial␣prosecutorsspecial␣rapporteursspecial␣resolutionsspectroastrometricspectrobolographicspectrocolorimeterspectrocolorimetryspectrodichrographspectrofluorimeterspectrofluorimetryspectrogoniometersspectrogoniometricspectrographicallyspectroheliographsspectroheliographyspectrohelioscopesspectrohelioscopicspectromicroscopicspectrophotometricspectropolarimeterspectropolarimetryspectropolariscopespectroradiometersspectroradiometricspermagglutinationsphaerobertranditespirit␣of␣Mindererusspirits␣of␣hartshornspiritual␣desertionspirocycloheptanesspirocyclopentanesspiroketalizationsspiroplectamminidssplit-complex␣numbersplit␣personalitiessplit-ring␣resonatorspoil␣someone␣rottenspondylarthritidesspondylotherapistsspongiotrophoblastSportsman's␣Paradisespot␣the␣differencesspurious␣diphthongsspurious␣infectionsstabilizer␣subgroupstandards␣compliantsteganographicallystencil␣duplicatorsstephanoberyciformstephanofilariasisstereofluoroscopicstereolithographicstereophotographicstereoradiographicstereospecificallySterling␣professorsstinking␣corpse␣lilystopping␣the␣pressesstorage␣hypervisorsstraight␣apostrophestrict␣implicationsstriped␣swampdragonstrontiopyrochloresubatomic␣particlessubpostmastershipssubrepresentationssubstitution␣ciphersubtropical␣cyclonesuccinylproteomicssugarcoated␣the␣pillsulfoniopropionatesulphochlorinationsuperaccommodatingsuperadministratorsuperagonisticallysupercivilisationssupercivilizationssupercolumniationssupercommunicatorssupercompensationssupercomputationalsuperconcentrationsupercondensationssuperconflagrationsuperconservatives

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