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There are 312 eighteen-letter words containing A, C, H, I, O and 2P

acute-phase␣proteinsad-hoc␣polymorphismsalphaphotographicsaminocephalosporinamphisphaeriaceousanalytic␣philosophyanisohypermetropicanthropic␣principleanthropogeographicanthropomorphisticanthropopathicallyanthroposophicallyapophthegmaticallyathletic␣supportersatlantoepistrophicbacteriopheophytinbiophilosophicallybiophysiographicalbiopsychospiritualbiphosphoglyceratecarbamoylphosphinecardiosphygmographcentrodiapophysealcephalaspidomorphscephaloradiographscephalothoracopagichaphamaparvovirusChappuis␣absorptionchemoprophylacticschromophotographicchronophotographiccinemaphotographercocktail␣party␣graphcommon␣hippopotamuscomparison␣shopperscomparison-shopping comparison␣shoppingcomplementopathiesCoppersmith's␣attackcorporal␣punishmentcorticohippocampalcreatine␣phosphatescritical␣philosophycyberphilosophicalcyclodiphosphazenecycloheptapeptidesdiphosphoglycerateecophilosophicallyelectrospinographyencephalomyopathicendophenotypicallyentopic␣graphomaniaepidemiogeographicepiphenomenalisticethnophilosophicalextrahepatosplenicextraphilosophicalfacies␣Hippocraticafront␣porch␣campaigngeophilosophicallyglycerophosphatidegraphopathologicalharmonic␣proportionhepatic␣portal␣veinshepatopancreatitishepatopathologicalhippocampectomizedhippocampocorticalHippocrates␣sleeves Hippocrates'␣sleevesHippocratic␣wreathsholoprosencephalichousehold␣appliancehydrolaparoscopieshypercompensationshypercritical␣pointhyperencapsulationhypermetamorphotichyperparakeratotichyperphosphataemichyperphysiologicalhyperpipecolatemiahyperprolactenemiahyperprolactinemiahyperprolactinemichypersophisticatedhypertranscriptionhypidiomorphicallyhypochondroplasiashypochondroplastichypocomplementemiahypophosphoric␣acidhyposulphurous␣acidideophonographicalimmunophenotypicalimmunoprophylacticinsipid␣schizotypalinstrument␣approachintrahippocampallyintraphilosophicalis␣the␣Pope␣a␣Catholickakorrhaphiophobicleptosphaeriaceouslight␣the␣touch-paperlipophosphoglycanslipopolysaccharidelymphocytapheresislymphoplasmacytoidlymphoplasmocytoidlymphoscintigraphylypopolysaccharidemetaphosphoric␣acidmicrophanerophytesmicrophotographersmicrophotographingmicrophytoplanktonmicrotopographicalmorphogeographicalmorphopathologicalmorphophonemicallymorphophonologicalnephropathologicalneurophilosophicalneuropsychopathiesnonanthropomorphicnonencephalopathicnonphilosophicallynontopographicallynormophosphataemicoccipitosphenoidaloctabromoporphyrinopposition␣researchopsonophagocytosisopsonophagocytoticorthotypographicalostarioclupeomorphp-acetylaminophenolpachycephalosauridpachychoroidopathypachypleurosauridspaedopsychologicalpaedopsychologistspalaeoceanographicpalaeogeographicalpalaeohydrographicpalaeontographicalpalaeopathologicalpalaeophycologicalpalaeopropithecidspaleobiogeographicpaleodemographicalpaleooceanographic

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