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There are 578 eighteen-letter words containing A, 2O, 2P and T

(page 3)

pathopsychologicalpentachlorophenolspeptostreptococcalperfluoropentacenepericonceptionallyperiodontopathogenperoxodiphosphatespersonal␣propertiespersonal␣protectorspetro-dictatorshipspharmacogenotypingpharmacopathogenicpharmacophenotypespharmacoprotectivepharmacoproteomicspharyngoepiglotticphosphoacetylationphosphocholinationphosphodiesterasesphosphofluoridatesphosphogartrellitephosphoglucomutasephosphohexomutasesphosphomannomutasephosphometabolitesphosphometabolomicphosphomevalonatesphosphonodiamiditephosphonodithioatephosphonopentanoicphosphonopyruvatesphosphonoselenoatephosphopantetheinephosphopentomutasephosphoribomutasesphosphoribosylatedphosphorocyanidatephosphorodiamidatephosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphosphorylcreatinephosphotransferasephosphotransmitterphosphotriesterasephotochronographicphotoconceptualismphotoconceptualistphotoelectrographsphotoencapsulationphotofluorographicphotogalvanographyphotoglottographicphotographic␣artistphotographic␣memoryphotographic␣papersphotographic␣platesphotoimmunotherapyphotoincorporationphotolithographersphotolithographingphotomicrographersphotomicrographingphotomorphologicalphotoorganotrophicphotoperoxidationsphotoperturbationsphotophosphorylasephotophysiologicalphotoplethysmogramphotopolymerizablephotoprecipitationphototherapeuticalphotothermoplasticphototopographicalphototypographicalphrasal␣prepositionphthirapterologistphylotranscriptomephysiopathogenesisphysiopathologicalphysiopathologistsphytomorphologicalphytopathogenicityphytopharmacologicphytophysiologicalphytoplanktivorousphytoplankton␣bloomphytotopographicalpicophotoautotrophpileated␣woodpeckerplagiogravitropismplainclothespersonplay␣the␣pronoun␣gamePointe␣Coupee␣Parishpolitical␣prisonerspolychemotherapiespolychromatophilespolychromatophiliapolychromatophilicpolyendocrinopathypolymorphonucleatepolyphosphorylatedpolyphthalocyaninepolyplethysmographpolypseudorotaxanepolysomnographistspolysporangiophytepontomesencephalicPoplar-Cotton␣Centerpopular␣etymologiespopulation␣geneticspopulation␣pyramidsportal␣hypertensionpositional␣asphyxiapostconceptionallypostconceptualistspostdepositationalpostdepositionallypostimplementationpostmultiplicationpostpancreatectomypostpericardiotomypostpolymerizationpostprecipitationspostpsychoanalyticpostranscriptionalpostrepolarizationpotato␣chip␣of␣the␣seapower␣of␣appointmentprecompositionallyprecontemporaneouspredispositionallyprehospitalizationprephosphorylatingprephosphorylationprepositional␣casesprepositional␣verbspreposition␣of␣placepreprosomatostatinpresuppositionallyprinter's␣apostropheprior␣probabilitiesproapolipoproteinsproazaphosphatraneprobationary␣periodprocardiomyopathicprofessional␣sportsproper␣accelerationpropiomelanocortinproportionablenesspropositional␣logic

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