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There are 759 eighteen-letter words containing D, 2I, O and P

(page 5)

pseudolongitudinalpseudomilitaristicpseudo-participialspseudopelletierinepseudophilosophiespseudoprotodioscinpseudoquantitative pseudo-quantitativepseudoreplicationspseudotrichonotidspseudouridylationspseudoverticillatepseudoxyrhophiinespulmonary␣docimasiaput␣someone␣in␣mind␣ofpyrazolopyrimidinepyridinylimidazolepyridylsulfoximinepyrimidodiazepinespyrimidopyrimidinepyrophosphoric␣acidpyrrolidinophenonequadripartitioningquasiperiodicitiesradiation␣impedanceradiation␣lampshaderadiation␣poisoningradiation␣pressuresradiation␣pyrometerradiocinematographradioimmunoproteinradioimmunotherapyradiological␣weaponradiomorphologicalradiopacificationsradiorespirometricradiospectrometricradiotelegraphistsradiotherapeuticalradiotherapeutistsRawalpindi␣Divisionrectosigmoidoscopyred␣imported␣fire␣antreepidermalizationreproductive␣rightsreprofessionalizedRepublic␣of␣DjiboutiRepublic␣of␣Maldivesresponding␣variableresponsible␣tradingreverse␣implied␣oddsromantic␣friendshipround-trip␣delay␣timeSaharanpur␣DivisionSanfilippo␣syndromeSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescansoriopterigidsscansoriopterygidsseismocardiographysemidirect␣productssemiphlogisticatedseparation␣of␣dutiessesquipedalophobiashuttle␣diplomaciessialoglycopeptidessialylglycopeptidesit-and-wait␣predatorsit␣up␣and␣take␣noticesleeping␣dictionarysociodemographicalsodicanthophyllitesodium␣hypochloritesodiumthiosulphate sodium␣thiosulphatesolenofilomorphidssolitary␣sandpiperssolubility␣productsspacefilling␣models space-filling␣modelsspecial␣proceedingsspectroradiometricsphingoglycolipidssphingophosphatidespinous␣spider␣crabsspiral␣of␣Archimedesspirit␣of␣Mindererusspiritual␣desertionspiroplectamminidssplendidofilariinespondylarthritidesspot-billed␣pelicansspurious␣diphthongsstaphylinidologiststaphylococcicidalstencil␣duplicatorsstereoradiographicstibiopalladinitessubdolichocephalicsulphantimonic␣acidsulpharsenious␣acidsulphindigotic␣acidsulphocarbonic␣acidsulphonic␣anhydridesulphotungstic␣acidsuperadministratorsuperdistributionssupergiant␣amphipodsupersophisticatedsuspended␣animationtelevision␣episodestelluropalladinitetendril␣perversionstenoepiphysiodesistetrahydropyridinetetraploidisationstetraploidizationstetratricopeptidesthaumatopsyllioidstherapeutic␣windowsthiophosphoric␣acidThird␣Epistle␣of␣Johnthree-point␣landingsthrombophlebitidestin-pot␣dictatorshiptipranavir␣disodiumtooth-billed␣pigeonstreiskaidekaphobiatriazolopyrimidinetrichlorodiphenylstriphosphoric␣acidstriskaidekaphobicstropical␣depressiontropodithietic␣acidtroubles␣in␣paradiseturned␣into␣a␣pumpkinultrasophisticatedundecylprodigiosinunderamplificationunderapproximating under-approximatingunderapproximation under-approximation

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