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There are 515 eighteen-letter words containing H, 2I, 2O, P and T

(page 3)

opposition␣researchorganolithotrophicornithocheiromorphorthopediatriciansorthopneic␣positionorthopsychiatristsoversophisticationpachinko␣allocationpachyrhizodontoidspalaeobiochemistrypalaeohistologicalpalaeopropithecidspalaeornithologistpaleoichthyologistpaleornithologicalpaleornithologistspaleospinothalamicpanhypoproteinemiapanhypoproteinemicpapilioerythrinonepathophysiologicalpathophysiologistspatristic␣anthologypetro-dictatorshipsphacomulcificationpharmacoinformaticpharyngoepiglotticpharyngotonsilitisphenomenalizationsphiloprogenitivelyphilosophunculistsphosphocholinationphospholipoproteinphosphonodiamiditephosphonodithioatephosphorecognitionphosphoriboproteinphosphorodiamidatephosphorodithioatephosphorothioationphosphoselectivityphosphosensitivityphosphospecificityphotoacclimationalphotoallergenicityphotoantimicrobialphotoassimilationsphotobiomodulationphotochlorinationsphotoconsistenciesphotocrosslinkingsphotocycloadditionphotodecompositionphotodegradabilityphotodensitometricphotodeteriorationphotodisintegratedphotodisintegratesphotodissociationsphotofunctionalizephotographic␣artistphotogravitationalphotoinactivationsphotoincorporationphotointermediatesphotoisomerisationphotoisomerizationphotolithographingphotomagnetizationphotomicrographingphoto␣opportunitiesphotoperiodicitiesphotoperoxidationsphotophysiologicalphotopiezoelectricphotoprecipitationphotorecombinationphotoreversibilityphotoselectivitiesphotosensitisationphotosensitivenessphotosensitivitiesphotosensitizationphotostabilizationphotosterilizationphotosubstitutionsphotoswitchabilityphototriangulationphrasal␣prepositionphthirapterologistphycoerythrobilinsphysicotheologicalphysiobiochemistryphysiopathogenesisphysiopathologicalphysiopathologistsphytopathogenicityphytophototoxicityphytophysiognomiesphytophysiologicalphytostabilisationphytostabilizationphytotoxicologicalplatinochloric␣acidPointe␣Coupee␣ParishPoint␣of␣the␣Mountainpoliticohistoricalpolychromatophiliapolychromatophilicpoor␣little␣rich␣girlpopping␣the␣questionporphyrinogenicitypositional␣asphyxiaposition␣of␣strengthpositive␣lookbehindpostbehavioralistspostrehabilitationpotassium␣hydroxideprehospitalizationpresynchronizationprocardiomyopathicprosecution␣historyprotease␣inhibitorsprothoracicotropicprotocatechuic␣acidprotochlorophilideprotomitochondrialprotomitochondrionpseudohamiltonianspseudoisochromaticpseudotrichonotidspsychoacousticianspsychocivilizationpsychohistoricallypsychologisticallypsychomanipulationpsychophysiologistpsychosemioticallypsychosociologistspsychosomatizationpsychostimulationsptilochronologicalpyelonephritogenicradiocinematographradioimmunotherapyrehospitalisationsrehospitalizationsretinohypothalamicrhinoseptoplastiessalpingooophoritis salpingo-oophoritisseptorhinoplastiesshooting␣from␣the␣hipshooting␣from␣the␣lip

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