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There are 369 eighteen-letter words containing I, O, P and 3T

absorption␣pipettesacanthopteroctetidacousto-optic␣effectactinotherapeuticsanatomopathologistAntarctic␣pearlwortanthropocentricityantiadaptationistsanticonceptionistsanticonceptualistsantihepatotoxicityantiplasticizationantipopulationistsantiprogestationalantiprohibitionistantithromboplastinantitransportationantitrypanosomatidaphthous␣stomatitisappeals␣to␣authorityaptahistochemistryargentopentlanditearithmetic␣operatorartist's␣conceptionsastrophotometricalathletic␣protectorsathletic␣supportersatlantoepistrophicautocapitalizationautoprotonizationsbetaproteobacteriaBohm␣interpretationBurkitt's␣lymphomatacatastrophizationschromopermittivityclimate␣catastropheclimatotherapeuticcompetition␣cautioncomputationalisticcomputation␣historycomputer␣scientistsConstantinopolitanconstitutional␣typeconstructed␣scriptsconstruction␣permitconstruction␣pointscontest␣competitionCoppersmith's␣attackcotransplantationscounteradaptations counter-adaptationscountercapitalistscounterdeputationscounterpetitionerscounterpetitioningcounterstereotypiccountertherapeuticcounties␣palatinatecreational␣patternscredit-deposit␣ratiocryptomathematicalcyclotetrapeptidescytohistopathologydecapitation␣strikedermatopathologistdermatotherapeuticdestruction␣permitsdietotherapeuticaldiffraction␣patterndrop␣like␣a␣hot␣potatodurational␣patternselectric␣potentialselectrode␣potentialelectrophotometricelectrotherapeuticentomopathogeneticerythrocytopathiesestimated␣positionsethnoprimatologistethnopsychiatristsextracomputationalextracytoplasmaticextrahematopoieticfloating-point␣unitsgastroenteroptosisgeopolitical␣entitygeopotential␣heightgerontotherapeutichaematopathologistheath␣spotted␣orchidhematopathologistshepatoarchitecturehepatocytotoxicityhepatolithectomieshepatopancreatitishepatopathologistsheptadecatrienoateheptatriacontanoichigh␣on␣the␣totem␣polehistocompatabilityhistocompatibilityhistomorphometristhypercontractilityhypercontractivityidentity␣politicianimmunopotentiatingimmunopotentiationimmunopotentiativeimmunopotentiatorsimmunopotentiatoryimmunoprotectivityinput␣method␣editorsinput-output␣sectioninstitute␣professorintegration␣by␣partsinteraction␣pictureintercompartmentalintercompatibilityinterphotoreceptorinterpretationallyinterpretationistsinterpretation␣signinterrogation-point interrogation␣pointinterrogative-pointinterstate␣compactsintertropical␣frontintracompartmentalintracytoplasmaticintraprostaticallyintrospectionisticintrospective␣sortsisotransplantationjump␣in␣with␣both␣feetkeep␣to␣one's␣knittingkeratoprecipitatesknights␣of␣the␣pestleknights␣of␣the␣spigotlectotypificationslifting␣the␣exponentlight␣the␣touch-paperlithoheterotrophiclithostratigrapherlithostratigraphiclittle␣spotted␣kiwislymphocytotoxicity

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