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There are 388 eighteen-letter words containing D, 2I, O, P, R and S

(page 3)

pyridylsulfoximinepyrimidodiazepinespyrophosphoric␣acidquasiperiodicitiesradiation␣lampshaderadiation␣poisoningradiation␣pressuresradiopacificationsradiorespirometricradiospectrometricradiotelegraphistsradiotherapeutistsRawalpindi␣Divisionrectosigmoidoscopyreproductive␣rightsreprofessionalizedRepublic␣of␣Maldivesresponding␣variableresponsible␣tradingreverse␣implied␣oddsromantic␣friendshipSaharanpur␣DivisionSanfilippo␣syndromeSao␣Tome␣and␣Principe São␣Tomé␣and␣Príncipescansoriopterigidsscansoriopterygidsseismocardiographysemidirect␣productsseparation␣of␣dutiessit-and-wait␣predatorsleeping␣dictionarysociodemographicalsodium␣hypochloritesolenofilomorphidssolitary␣sandpiperssolubility␣productsspecial␣proceedingsspectroradiometricspinous␣spider␣crabsspiral␣of␣Archimedesspirit␣of␣Mindererusspiritual␣desertionspiroplectamminidssplendidofilariinespondylarthritidesspurious␣diphthongsstencil␣duplicatorsstereoradiographicsulpharsenious␣acidsulphocarbonic␣acidsulphonic␣anhydridesuperadministratorsuperdistributionssupergiant␣amphipodsupersophisticatedtendril␣perversionstetraploidisationstetraploidizationstetratricopeptidestherapeutic␣windowsthiophosphoric␣acidThird␣Epistle␣of␣Johnthree-point␣landingsthrombophlebitidestin-pot␣dictatorshiptipranavir␣disodiumtreiskaidekaphobiatrichlorodiphenylstriphosphoric␣acidstriskaidekaphobicstropical␣depressiontroubles␣in␣paradiseultrasophisticatedundecylprodigiosinunderexploitationsunderspecificationundersubscriptionsunder␣the␣impressionunprofessionalisedunprofessionalizedupdating␣one's␣priorsUpper␣Assam␣Divisionupstairs-downstairsVardinske␣Toplicevelocipedestriennevelocity␣dispersionvery␣special␣episodevideodermoscopicalvideolaryngoscopicvideostroboscopieswhite-tailed␣ploverswide␣spots␣in␣the␣roadxerothermic␣periods

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