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There are 387 eighteen-letter words containing A, C, G, H, I, O and S

(page 2)

heavy␣goods␣vehicleshelioseismologicalhematomalignancieshemilaryngectomieshepatohistologicalheptadecaglycosideheteroantagonistichistocytologicallyhistoenzymologicalhistoimmunologicalhistomorphologicalhistophysiologicalhistotechnologicalholding␣all␣the␣cardshomocysteinylatingHopcroft's␣algorithmhorseless␣carriageshorses␣and␣carriageshunger␣is␣a␣good␣saucehydroclimatologisthydrostratigraphichyperbolic␣tangentshyperglycosylatinghyperglycosylationhyperphysiologicalhypogranulocytosishysterographicallyIcelandic␣Sheepdogsimmunohistologicalimmunoscintigraphyinorganic␣chemistryintrapsychologicalisobolographicallyisochlorogenic␣acidisoglycyrrhizinatekinetocardiographsKociemba's␣algorithmlagochilascariasislength␣contractionslights,␣camera,␣actionlipophosphoglycanslithostratigraphiclogarithmic␣spiralslongnose␣lancetfishlymphangiosarcomaslymphomalignancieslymphoscintigraphymacrophysiologicalmacrostratigraphicmagnesiocarpholitemagnesiochloritoidmagnetohydrostaticmagnetosphericallymathematical␣logicsmechanocardiogramsmechanotransducingmedia␣archaeologistmenigoencephalitismetalexicographersmicroangiographiesmicrocosmographiesmicroneurographersmicrophotographersmicrophysiologicalmicroretrognathismmicrostratigraphicmint␣pars␣of␣exchangemoccasin␣telegraphsmorphohistologicalmultichromatogramsmycobacteriophagesnavigational␣chartsnavigation␣channelsneoglyphioceratidsneurophysiologicalneuropsychologicalnonhistoriographicnonphysiologicallynormophysiologicaloesophagobronchialold␣English␣carriers old␣English␣Carriersoligochaetologistsoligosaccharidosisopsonophagocytosisopsonophagocytoticorganisation␣chartsorganization␣chartsorganotherapeuticsoriginal␣charactersoscillographicallyosteoarchaeologistosteoarcheologicalosteoarcheologistsosteomorphologicalpaedopsychologicalpaedopsychologistspalaeogeochemistrypalaeohistologicalpaleoichthyologistpaleophysiologicalpaleopsychologicalparaphonia␣clangenspathophysiologicalpathopsychologicalpatristic␣anthologyphallologocentrismphantasmagoricallyphantom␣pregnanciespharmacoepigenomespharmacogeneticistpharmacophysiologypharyngobranchialsphonomicrosurgicalphosphoglucokinasephosphoglucosaminephotochemical␣smogsphotographic␣artistphotographic␣papersphotographic␣platesphotomicrographersphotophysiologicalphylostratigraphicphysical␣geographerphysicotheologicalphysiogeographicalphysiopathologicalphytophysiologicalpicking␣and␣choosingplay␣one's␣cards␣rightplethysmographicalploughman's␣sandwichpolypharmacologiespolysomnographicalprosopographicallyprotopsychologicalpseudobiographicalpseudomythologicalpseudopathologicalpseudophotographicpseudopornographicpsychic␣photographypsychobiographicalpsychobiologicallypsychocosmologicalpsychodermatologicpsychogeographicalpsychogeriatricianpsychographologistpsycholinguistical

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