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There are 518 eighteen-letter words containing I, 3O, S and 2T

(page 3)

oligochaetologistsoligoteratospermiaontoepistemologiesoperationalisationopsonophagocytoticOriental␣Orthodoxesorthogonalisationsorthogonalizationsorthonormalisationorthopneic␣positionorthosubstitutionsosteoarchaeologistosteoarcheologistsosteoarthrectomiesosteoarthropathiesosteoblastogenesisosteocalcificationosteocartilagenousosteocartilaginousosteochondropathiaosteoclastogenesisosteoclastogeneticosteocompatibilityosteoproliferationosteoproliferativeosteoradionecroticOstrogothic␣Kingdomother␣side␣of␣the␣coinouter␣automorphismsovariohysterectomyoverextrapolationsoversophisticationpalaeoentomologistpalaeoethnologistspalaeopathologistspalaeornithologistpaleoclimatologistpaleoentomologistspaleoethnobotanistpaleoherpetologistpaleoichthyologistpaleornithologistspathophysiologistsphosphoacetylationphosphodestructionphosphometabolitesphosphonodithioatephosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphotoassimilationsphotochlorinationsphotoconceptualismphotoconceptualistphotoconsistenciesphotodecompositionphotodensitometersphotodensitometricphotodissociationsphotodocumentariesphotoencapsulationphotoendosomolyticphotoendosymbiontsphotofermentationsphotoinactivationsphotoisomerisationphotoisomerizationphotokeratectomiesphotolithographersphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotoperturbationsphotoregenerationsphotoreproductionsphotorespirometersphotosensitisationphotosensitizationphotospectrometricphotospectroscopicphotostabilizationphotosterilizationphotosubstitutionsphotothermoplasticphysiopathologistsphytomorphologistsphytoplanktivorouspoints␣of␣inflectionPoland␣Is␣Not␣Yet␣Lostpolitical␣economistpolitical␣footballspoliticohistoricalpoor␣is␣a␣state␣of␣mindportoenterostomiespositional␣notationposition␣of␣strengthpostbronchodilatorpostcommissurotomypostconceptionallypostconstitutionalpost-creole␣continuapostdepositationalpostdepositionallypostfoundationallypost␣mortem␣auctorispostorbitofrontalspostpericardiotomypostpolymerizationpostrepolarizationpotato␣chip␣of␣the␣seapreprosomatostatinproatheroscleroticprognostificationsproposition␣nationsprosecution␣historyprosperity␣theologyproteochemometricsproteolipoproteinsprotoconversationsprotocycloceratidsprotodeboronationsprotodesilylationsprotomicrocotylidsprotomyofibroblastprotopsychologistsProto-South␣Sulawesiprototype␣extensionpseudoobstructionspseudotrichonotidspsychopathologistspsychosomatizationput␣out␣of␣one's␣miseryput␣someone's␣pipe␣outquantities␣of␣motionread␣someone␣to␣filthrectosigmoidectomyrelative␣topologiesrenohistopathologyrestoration␣ecologyretroaldolizationsretrotranslocationretrotranspositionrevolutionisationsrevolutionizationsrides␣the␣cotton␣ponyride␣the␣cotton␣horserootinest␣tootinest rootin'est␣tootin'est

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