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There are 145 eighteen-letter words containing 4O and 2P

allegro␣ma␣non␣troppoanthropomorphologyanthropomorphouslyautolipophagosomesBononian␣phosphorusbromochloropropanechlorophototrophicchloropyromorphitechromophotographicchronophotographiccoloesophagoplasty colo-esophagoplasty colo␣esophagoplastycommon␣hippopotamuscomparison␣operatorcompound␣microscopecompound␣proportioncomproportionatingcomproportionationcopromicroscopicalcopromycetophagouscoproparasitologiccoproparasitoscopycoproporphyrinogencounteroppositionscounterpropositiondisproportionationDoctor␣of␣Philosophydrop␣like␣a␣hot␣potatoentomophytophagouseosinophilopoiesiseosinophilopoieticepipodophyllotoxinfluorophosphonatesglucolipoapoptosisharmonic␣proportionmodus␣ponendo␣ponensmonoisopropylaminemonophosphokinasesmonophosphorylatedmonothiophosphatesmorphopathologicalmorphophonologicalmorphophonologistsnonanthropomorphicnonphosphorylationnonproportionalityoctabromoporphyrinoligooxopiperazineone␣potato,␣two␣potatoopen␣a␣can␣of␣whoop␣assophthalmopathologyopsonophagocytosedopsonophagocytosesopsonophagocytosisopsonophagocytoticorganophosphonatesorthopantomographsorthopantomographyorthopneic␣positionostarioclupeomorphout␣of␣all␣proportionoverproportionallypalaeoanthropology palæoanthropologypaleogeomorphologypaleozoogeographerpanproctocolectomyparacrocodylomorphpathomorphologicalperiodontopathogenperonosporomycetespersons␣from␣Porlockphosphocholinationphosphoisoprenoidsphospholipoproteinphosphometabolomicphosphoneoepitopesphosphonodithioatephosphonoglycerolsphosphonopentanoicphosphonoselenoatephosphorecognitionphosphoriboproteinphosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphotochronographicphotodecompositionphotofluorographicphotogeomorphologyphotoglottographicphotoheterotrophicphotoincorporationphotomorphogenesisphotomorphogeneticphotomorphologicalphoto␣opportunitiesphotoorganotrophicphotoperoxidationsphotophosphorylasephotophysiologicalphotoreproductionsphotospectroscopicphototopographicalphytomorphologicalphytomorphologistsphytophenomenologyphytophototoxicityphytoplankton␣bloompicophotoautotrophpleurolophocercouspneumocolonographypolydolopimorphianpolyphloroglucinolproapolipoproteinsprocolophonomorphspromorphologicallypropiomelanocortinpropositional␣logicproposition␣nationsproteolipoproteinsproteopolymersomesprothoracicotropicprotochlorophilideProto-Indo-Europeansprotoporphyrinogenprotopsychologicalprotopsychologistsproximoposteriorlypseudoprotodioscinpyrophosphorolysispyrophosphorolyticpyropoikilocytosissalpingooophoritis salpingo-oophoritissociophilosophicalsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspongiotrophoblastsulfoniopropionatesymproportionationzoosporangiophores

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