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There are 697 twenty-one-letter words containing 2I, O, P and R

(page 3)

human␣papillomaviruseshydrazinophthalazineshydrodesulphurisationhydrodesulphurizationhydrophosphinylationshyperbolic␣polynomialshyperbolic␣quaternionshypercalprotectinemiahypercatecholaminemiahypercholesterinaemiahyperchylomicronaemiahyperfibrinogenolysishypergonadotropinemiahyperhaemoglobinaemiahyperhomocysteinaemiahyperhomocysteinemiashyperlipoproteinaemiahyperlipoproteinaemichyperlipoproteinemiashyperparameterisationhyperparameterizationhyperpolarizabilitieshyperpolyploidizationhyperthermoacidophilehypervascularizationshypoelliptic␣operatorshypoproaccelerinaemiahypoproconvertinaemiaIBM␣Pollyanna␣Principleichthyogeographicallyidiopathic␣hypersomniaimidazolonepropionaseimidazolonepropionateimmunochromatographicimmunoelectrophoresisimmunoelectrophoreticimmunohistomorphologyimmunopharmaceuticalsimmunopharmacologicalimmunopharmacologistsimmunophotosensitizerimmunotherapeuticallyimperative␣programmingImperial␣stormtroopers Imperial␣Stormtroopersimprovisational␣comedyinbreeding␣depressionsinclusion␣polymorphismincomprehensibilitiesincorporated␣companiesinferior␣petrosal␣sinusinfranasal␣depressionsinitial␣public␣offeringinner␣orbital␣complexesinquisition␣post␣morteminsulin␣shock␣therapiesintercalation␣compoundintercomplementationsinterjectional␣phrasesintermetallic␣compoundinternal␣carotid␣plexusinternational␣airportsinterpetiolar␣stipulesinterresponsibilitiesinterrogative␣pronounsintrapetiolar␣stipulesintrospection␣illusioninversely␣proportionalInvisible␣Pink␣Unicornsirreducible␣complexityIslamic␣Republic␣of␣Iranisometric␣perspectivesisopropylthioxanthoneItalian␣Social␣Republicivory-billed␣woodpeckerkeeping␣the␣ball␣rollingKenai␣Peninsula␣BoroughkinetofragminophoranskleptochloroplastidicKoolpinyah␣threadtailsKoprivničko-križevačkalaparoscopic␣surgeriesLaredo␣striped␣whiptailleader␣of␣the␣opposition Leader␣of␣the␣Oppositionlean␣nitrogen␣oxide␣traplevatores␣veli␣palatinilienophrenic␣ligamentslinear␣algebraic␣groupslipotetradecapeptidesliquefied␣petroleum␣gasliquid␣mirror␣telescopelithographic␣limestonelow-density␣lipoproteinlymphangiographicallylymphoepitheliotropicmalicious␣prosecutionsmarginal␣cost␣of␣capitalmarket␣capitalizationsmechanical␣lithospheremedial␣pterygoid␣musclemembranoproliferativemercaptopropionic␣acidmesangioproliferativemetalexicographicallymetallic␣waterproofingmetatranscriptionallymethyldihydromorphinemicroangiographicallymicroautoradiographicmicrocompartmentationmicroentrepreneurshipmicroionophoreticallymicrolymphangiographymicromorphometricallymicropalaeontologicalmicropalaeontologists micropalæontologistsmicrophotodisruptionsmicrothrombocytopeniamicroviscoamylographsminimal␣viable␣productsminimum␣viable␣productsmonadic␣predicate␣logic

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