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There are 412 eighteen-letter words containing A, H, I, O, 2P and R

(page 3)

polypharmaceuticalpolypharmacologiespolyphosphoric␣acidpolysomnographicalpolysomnographistspolysporangiophyteportal␣hypertensionprehospitalizationprephosphorylatingprephosphorylationprimary␣hypothermiaprinciple␣of␣charityprinter's␣apostropheprocardiomyopathicprolymphangiogenicpromorphologicallyprosopographicallyproteocephalideansprothoracicotropicprotoanthophylliteprotopsychologicalpseudobiographicalpseudohyperkalemiapseudohyponatremiapseudoparaphylliumpseudophotographicpseudopornographicpseudo-scholarshipspsychic␣photographypsychobiographicalpsychogeographicalpsychographologistpsychopharmaceuticpsychoprophylacticpsychotherapeuticspsychotherapeutistpteromerhanophobiapterylographicallypupillographicallyput␣through␣its␣pacespyrophosphokinasespyrophosphoramidespyrophosphoric␣acidPythagorean␣triplesradiculoplexopathyreality␣pornographyrephosphorylationsrhinoseptoplastiessalpingooophoritis salpingo-oophoritissalpingopharyngealsalpingopharyngeussecondary␣phosphineseptorhinoplastiessharp-tailed␣sparrowshipping␣containerssince␣Hector␣was␣a␣pupslapping␣on␣the␣wristsocial␣partnershipssomatoparaphreniassonosalpingographysonospectrographicSophie␣Germain␣primesopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspectrobolographicspectrodichrographspectrographicallyspectroheliographsspectroheliographyspelaeogriphaceansspirocycloheptanesspondyloperipheralspondylotherapistsspongiotrophoblaststereophotographicstraight␣apostrophesubpostmastershipssupergiant␣amphipodsuperphenomenalitysuperphysiologicalsupersophisticatedsupraphysiologicalsympathetic␣powderstephrostratigraphytertiary␣phosphinestetrakisphosphatestetrathiophosphatetheophilanthropismtheophilanthropistthiophosphoric␣acidthiophosphorylatedthiopyrophosphatesthird-person␣pluralsthromboprophylaxistin-pot␣dictatorshiptrialkylphosphinestricresyl␣phosphatetrimethylolpropanetriphenylphosphanetriphenylphosphatetriphosphoric␣acidstriphosphorylationtypographical␣errorvertical␣apostrophevideo␣photographerswoodchip␣wallpaperszoosporangiophores

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