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There are 358 eighteen-letter words containing I, 2P, R and 2S

(page 3)

spectrohelioscopesspectrohelioscopicspectromicroscopicspectropolariscopespelaeogriphaceansspikes␣a␣temperaturespinous␣spider␣crabsspinycheek␣sleepersspirocycloheptanesspirocyclopentanesspirocyclopropanesspiroplectamminidssplit␣personalitiesspondylotherapistsspongiotrophoblastSportsman's␣ParadiseSprengel␣explosivesspurious␣diphthongsspur-winged␣lapwingsstopping␣the␣pressesstraight␣apostrophestriped␣swampdragonsubpostmastershipssupercompensationssuperenciphermentssuperimpregnationssuperintendentshipsuperminicomputerssupernova␣impostorssupernumeraryshipssuperparamagnetismsuperpersonalitiessuperphysiologicalsuperpositionalitysuperprofessionalssuperproficienciessupersophisticatedsupersuperlatively super-superlativelysuppressive␣personssupraphysiologicalsympathetic␣powderssymplectomorphismstenderpreneurshipstertiary␣phosphinestetradepsipeptidestetrakisphosphatesthiopyrophosphatesthird-person␣pluralsthrombosuppressionthrombosuppressivetranspolyisoprenestranspyloric␣planestrialkylphosphinestricresyl␣phosphatetriisopropylsilanetriphosphoric␣acidstrivinylphosphinestropical␣depressiontrypanosusceptibletype␣introspectionsUmklapp␣scatteringsunappreciativenessunapprehensivenessupdating␣one's␣priorsUpper␣Assam␣Divisionupper␣middle␣classesvery␣special␣episodeviviparous␣eelpoutsWhatsApp␣Universityyellow␣lady's␣slipperzoosporangiophores

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