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There are 1133 twenty-one-letter words containing I, O, P and S

(page 4)

heteropolymerizationsheteropolysaccharidesheterotransplantationhexafluoroisopropanolhigh-fructose␣corn␣syrup high␣fructose␣corn␣syruphighly␣composite␣numberhighly␣sensitive␣personhigh-occupancy␣vehicles high␣occupancy␣vehicleshigh␣probability␣tradesHis␣Majesty's␣Oppositionhistomorphometricallyhistorical␣interpreterhistoricogeographicalhistoriophilosophicalhomeotransplantationshomogeneous␣polynomialhomogenous␣polynomialshow␣can␣you␣sleep␣at␣nighthow␣do␣you␣spell␣this␣wordhuman␣papillomaviruseshydrazinophthalazineshydrodesulphurisationhydrodesulphurizationhydrohemicryptophyteshydrophosphinylationshydrophosphonylationshydroureteronephrosishydroxyprostaglandinshyperbolic␣polynomialshyperbolic␣quaternionshypercholesterinaemiahypercholesterolaemiahypercholesterolaemichypercholesterolemiashypercholesterolemicshyperfibrinogenolysishyperhomocysteinaemiahyperhomocysteinemiashyperlipoproteinemiashyperparameterisationhyperphosphorylationshyperpolarizabilitieshypertestosteronaemiahypervascularizationshypoelliptic␣operatorshysterosalpingographyichthyoplanktologistsidiopathic␣hypersomniaI␣have␣low␣blood␣pressureimidazolonepropionaseimmunoelectrophoresesimmunoelectrophoresisimmunohistomorphologyimmunohistopathologicimmunopathophysiologyimmunopharmaceuticalsimmunopharmacologistsimmunophotosensitizerimmunophysiopathologyImperial␣stormtroopers Imperial␣Stormtroopersimprovisational␣comedyinbreeding␣depressionsinclusion␣polymorphismincomprehensibilitiesincorporated␣companiesindependent␣possessiveinferior␣petrosal␣sinusinfranasal␣depressionsinfraprezygapophysealinner␣orbital␣complexesinositolphosphoglycaninositolphospholipidsinquisition␣post␣morteminstant␣mashed␣potatoesinsulin␣shock␣therapiesintercomplementationsinterhalogen␣compoundsinterjectional␣phrasesinternal␣carotid␣plexusinternational␣airportsinterpetiolar␣stipulesinterprezygapophysealinterresponsibilitiesinterrogative␣pronounsintrapetiolar␣stipulesintraprezygapophysealintrospection␣illusioninversely␣proportionalInvisible␣Pink␣UnicornsIslamic␣Republic␣of␣Iranisometric␣perspectivesisopropylthioxanthoneItalian␣Social␣RepublicJapanese␣bunching␣onionJoule-Thomson␣expansionjump␣before␣one␣is␣pushedkeeping␣one's␣eyes␣peeledkeeping␣one's␣lips␣sealedkeeping␣one's␣own␣counselkeep␣one's␣head␣on␣a␣swivelkeep␣one's␣stick␣on␣the␣icekeeps␣someone␣in␣the␣loopkeeps␣up␣with␣the␣Joneseskeep␣to␣one's␣own␣knittingKenai␣Peninsula␣BoroughkinetofragminophoranskleptochloroplastidicKoolpinyah␣threadtailslabioglossopharyngeallaparoscopic␣surgeriesLaredo␣striped␣whiptaillaryngobronchoscopiesleader␣of␣the␣opposition Leader␣of␣the␣Oppositionleaves␣one's␣options␣openleft-handed␣compliments

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