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There are 143 eighteen-letter words containing O, P, R, T and X

AIDS-related␣complexAlexandrov␣topologyantibioprophylaxisapartment␣complexesauxiliary␣power␣unitbaritone␣saxophonesBhartrhari's␣paradoxbijoux␣problemettesbisperoxovanadatesbootstrap␣paradoxesBordeaux␣turpentinebox␣and␣whisker␣plotsbox␣and␣whiskers␣plotBurali-Forti␣paradoxcamphocarboxylatescarboxydipeptidasecarboxyprothrombincofactor␣expansionsconjugate␣redox␣paircontrol␣experimentscoordinated␣complexcopy-on-write␣proxiescorporate␣executivecounterexemplifiedcounterexemplifiescounterexplanationcounterexpositionsdeacetoxyscirpenoldeoxytylophorininedextroamphetaminesdextropropoxyphenediacetoxyscirpenoldihydroxypteridineejaculation␣praecoxelectroaxonographyexcavator␣operatorsexecutive␣producersexecutive-producing executive␣producingexoatmosphericallyexophthalmic␣goiterexophthalmic␣goitreexplanatory␣fictionexponential␣growthsexposure␣treatmentsexpression␣templateextemporaneousnessextermination␣campsextracompartmentalextracomputationalextracorporealizedextracytoplasmaticextrahematopoieticextrahepatobiliaryextrahepatosplenicextramorphologicalextraphilosophicalextraphysiologicalextreme␣programmersextreme␣programmingex-tropical␣cyclonesgrandfather␣paradoxgross␣receipts␣taxeshematopneumothoraxheterocomplexationhexaphosphorylatedhydroperoxidationshydroperoxylationshydrophenoxylationhydrostatic␣paradoxhydroxyamphetaminehydroxymaprotilinehydroxynaphthalenehydroxyphosphonatehydroxytryptamineshydroxytryptophanshypersexualisationhypersexualizationhyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiasinferiority␣complexmere␣exposure␣effectmetalexicographersmethoxytryptophansmint␣pars␣of␣exchangeMorris␣the␣Explainernanohydroxyapatiteneurosporaxanthineneurotoxoplasmosisnicotine␣polacrilexoportuzumab␣monatoxout-of-box␣experienceoverapproximations over-approximationsoverextrapolationsoxygen␣catastrophesparadoxes␣of␣fictionpentacarbon␣dioxidepentaformylgitoxinperfluorohexanoateperformance␣anxietyperoxodiphosphatesperoxomonosulfatespharmacotoxicologyphotic␣sneeze␣reflexphotoperoxidationspinxterbloom␣azaleapolycontexturalitypolypseudorotaxaneportable␣executablepotassium␣hydroxidepredecarboxylationproofs␣by␣exhaustionprototype␣extensionProxima␣Centauriansproximate␣principleproximoposteriorlypseudoexacerbationradiculoplexopathyreprotoxicologicalseparable␣extensionSeptember␣equinoxessexual␣reproductionsoprano␣saxophonistsplit-complex␣numbersuperexponentiallysuperextraordinarysuperiority␣complexsympathoexcitatorythought␣experimentsthromboprophylaxesthromboprophylaxistoxicopharmacologyunderapproximating under-approximatingunderapproximation under-approximationunderexploitationsunderextrapolationxenotransplantablexenotransplantingsxerothermic␣periods

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