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There are 137 eighteen-letter words containing I, P, R, T and X

administratrixshipAIDS-related␣complexantibioprophylaxisauxiliary␣power␣unitbaritone␣saxophonesBhartrhari's␣paradoxbijoux␣problemettesbisperoxovanadatesBordeaux␣turpentinebox␣and␣whisker␣plotsbox␣and␣whiskers␣plotBurali-Forti␣paradoxcapital␣expenditurecarboxydipeptidasecarboxyprothrombincofactor␣expansionsconjugate␣redox␣paircontrol␣experimentscoordinated␣complexcopy-on-write␣proxiescorporate␣executivecounterexemplifiedcounterexemplifiescounterexplanationcounterexpositionsdeacetoxyscirpenoldeoxytylophorininedextroamphetaminesdiacetoxyscirpenoldihydroxypteridinediphenylhexatrieneejaculation␣praecoxenergy␣expendituresexecutive␣privilegeexecutive␣producersexecutive-producing executive␣producingexoatmosphericallyexophthalmic␣goiterexophthalmic␣goitreexperience␣meetingsexperimental␣designexperimentum␣crucisexplanatory␣fictionexponential␣growthsexpression␣templateextermination␣campsextracomputationalextracorporealizedextracytoplasmaticextradiaphragmaticextrahematopoieticextrahepatobiliaryextrahepatosplenicextramorphologicalextraparliamentaryextraphilosophicalextraphysiologicalextrascripturalityextreme␣programmingex-tropical␣cyclonesganzfeld␣experimentgedankenexperiment gedanken␣experimentgross␣receipts␣taxesheterocomplexationhydroperoxidationshydroperoxylationshydrophenoxylationhydrostatic␣paradoxhydroxyamphetaminehydroxymaprotilinehydroxytryptamineshyperextensibilityhypersexualisationhypersexualizationhyperthyroxinaemiahyperthyroxinaemichyperthyroxinemiasinferiority␣complexIrving␣the␣Explainermetalexicographersmint␣pars␣of␣exchangeMorris␣the␣Explainernanohydroxyapatiteneurosporaxanthineneurotoxoplasmosisnicotine␣polacrilexout-of-box␣experienceoverapproximations over-approximationsoverextrapolationspanexperientialismpanexperientialistparadoxes␣of␣fictionpentacarbon␣dioxidepentaformylgitoxinperformance␣anxietyperoxodiphosphatespharmacotoxicologyphotic␣sneeze␣reflexphotoperoxidationsphysician␣extenderspinxterbloom␣azaleapolycontexturalitypotassium␣hydroxidepredecarboxylationproofs␣by␣exhaustionprototype␣extensionProxima␣Centauriansproximate␣principleproximoposteriorlypseudoexacerbationradiculoplexopathyreprotoxicologicalscience␣experimentsseparable␣extensionSeptember␣equinoxessexual␣reproductionsoprano␣saxophonistsplit-complex␣numbersuperexponentiallysuperextraordinarysuperiority␣complexsympathoexcitatorytherapeutic␣indexesthought␣experimentsthromboprophylaxistoxicopharmacologyunderapproximating under-approximatingunderapproximation under-approximationunderexploitationsunderextrapolationxenotransplantingsxerothermic␣periods

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