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There are 387 eighteen-letter words containing D, 2I, O, P, R and T

(page 3)

pseudouridylationspseudoverticillatequadripartitioningquasiperiodicitiesradiation␣impedanceradiation␣lampshaderadiation␣poisoningradiation␣pressuresradiation␣pyrometerradiocinematographradioimmunoproteinradioimmunotherapyradiopacificationsradiorespirometricradiospectrometricradiotelegraphistsradiotherapeuticalradiotherapeutistsrectosigmoidoscopyred␣imported␣fire␣antreepidermalizationreproductive␣rightsRepublic␣of␣Djiboutiresponsible␣tradingromantic␣friendshipround-trip␣delay␣timeSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescansoriopterigidsscansoriopterygidssemidirect␣productsseparation␣of␣dutiessit-and-wait␣predatorsleeping␣dictionarysodium␣hypochloritesolitary␣sandpiperssolubility␣productsspectroradiometricspirit␣of␣Mindererusspiritual␣desertionspiroplectamminidsspondylarthritidesspurious␣diphthongsstencil␣duplicatorsstereoradiographicsuperadministratorsuperdistributionssupergiant␣amphipodsupersophisticatedtelluropalladinitetendril␣perversionstetrahydropyridinetetraploidisationstetraploidizationstetratricopeptidestherapeutic␣windowsthiophosphoric␣acidThird␣Epistle␣of␣Johnthree-point␣landingsthrombophlebitidestin-pot␣dictatorshiptipranavir␣disodiumtreiskaidekaphobiatriazolopyrimidinetrichlorodiphenylstriphosphoric␣acidstriskaidekaphobicstropical␣depressiontropodithietic␣acidtroubles␣in␣paradiseturned␣into␣a␣pumpkinultrasophisticatedunderamplificationunderapproximating under-approximatingunderapproximation under-approximationunderexploitationsunderparticipationunderproliferationunderspecificationundersubscriptionsunder␣the␣impressionupdating␣one's␣priorsupstairs-downstairsVardinske␣Toplicevelocipedestriennevelocity␣dispersionvideokeratographicvideostroboscopieswhite-tailed␣ploverswide␣place␣in␣the␣roadwide␣spots␣in␣the␣roadxerothermic␣periods

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