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There are 799 eighteen-letter words containing H, 2I, 2O and R

(page 5)

phosphoriboproteinphosphorodiamidatephosphorodithioatephosphorothioationphotoallergenicityphotoantimicrobialphotochlorinationsphotocrosslinkingsphotodegradabilityphotodensitometricphotodeteriorationphotodisintegratedphotodisintegratesphotographic␣artistphotogravitationalphotoincorporationphotointermediatesphotoisomerisationphotoisomerizationphotolithographingphotomicrographingphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotopiezoelectricphotoprecipitationphotorecombinationphotoreversibilityphotosterilizationphototriangulationphrasal␣prepositionphthirapterologistphycoerythrobilinsphysiobiochemistryphysiogeographicalpiezopsychrophilicplatinochloric␣acidPointe␣Coupee␣Parishpoliticohistoricalpolychromatophiliapolychromatophilicpolydolopimorphianpolyphosphoric␣acidpolyvinylchlorides polyvinyl␣chloridespoor␣little␣rich␣girlporphyrinogenicityposition␣of␣strengthpostbehavioralistspostrehabilitationpotassium␣hydroxideprehospitalizationpresynchronizationprocardiomyopathicprolymphangiogenicprosecution␣historyprospidium␣chlorideprotease␣inhibitorsprothoracicotropicprotocatechuic␣acidprotochlorophilideprotomitochondrialprotomitochondrionpseudobiographicalpseudoisochromaticpseudotrichonotidspseudoxyrhophiinespsychobiographicalpsychohistoricallyptilochronologicalpulling␣in␣one's␣hornspyelonephritogenicpyrophosphoric␣acidpyrrolidinophenonequasimonochromaticradiochronologicalradiocinematographradiohalogenationsradiohumeral␣jointsradioimmunotherapyradiomorphologicalrecatholicizationsrehospitalisationsrehospitalizationsresidential␣schoolsresynchronisationsresynchronizationsretinohypothalamicrheofluidificationrhetorical␣questionrhinoseptoplastiesrhombitrihexagonalRobinson␣arithmeticrule␣with␣a␣rod␣of␣ironSakharov␣conditionssalpingooophoritis salpingo-oophoritissaurornitholestineschool-dinner␣ladies school␣dinner␣ladiesscimitar-horned␣oryxScotch␣marine␣boilerseeing␣someone␣rightseismocardiographysemi-boarding␣schoolsensoribehaviouralseptorhinoplastiessets␣one's␣hair␣on␣fireshooting␣from␣the␣hipshooting␣from␣the␣lipshoving␣it␣up␣your␣asssociochronobiologysociodemographicalsoda␣fountain␣chairssodium␣borohydridessodium␣hypochloritesolenofilomorphidssole␣proprietorshipSouthern␣Californiaspectrohelioscopicspirits␣of␣hartshornspurious␣diphthongsstereohistologicalstereolithographicstereoradiographicstoichiometricallystrontiochevkinitestyrylisothiazolessucking␣the␣air␣out␣ofsulfochlorinationssulphocarbonic␣acidsulphochlorinationsuperoleophobicitysuperphysiologicalsuperstoichiometrysupraphysiologicalsympathoinhibitorssympathoinhibitorysyringohydromyeliatauroselcholic␣acidterminal␣bronchioletetraiodothyroninethanatomicrobiomictheological␣virtuestheophilanthropismtheophilanthropisttheory␣of␣relativity

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