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There are 142 eighteen-letter words containing 3O, 2P and 2T

allotetrapolyploidanthropomorphisticanthropomorphitismapometalloproteinsarterioportographyastrophotographersautophosphorylatedautophosphorylatesbalneophototherapybootstrap␣paradoxeschlorophototrophiccomproportionatingcomproportionationcomputed␣tomographycounteroppositionscounterpropositiondermatopathophobiadisproportionalitydisproportionatelydisproportionatingdisproportionationdon't␣get␣your␣hopes␣updrop␣like␣a␣hot␣potatoelectrophotographyentomophytophagoushepatopathologicalhepatopathologistshistoricopropheticHittorf's␣phosphorushypersomatotropismhypopalmitoylationinterphotoreceptorkleptochloroplastslepidopterologistsmercaptopropionatemetropolitan␣bishopmicrophytoplanktonmonothiophosphatesmultiphotoreceptornanophytoplanktonsnephropathologistsnonproportionalitynostocyclopeptidesnot␣wrapped␣too␣tightobject␣pool␣patternsone␣potato,␣two␣potatoophthalmopathologyopsonophagocytoticorthopantomographsorthopantomographyorthopneic␣positionorthotypographicalout␣of␣all␣proportionpalaeopathologistspalaeotempestologypaleoanthropometrypaleoherpetologistpanproctocolectomypathophysiologistspeptostreptococcalperiodontopathogenpersonal␣protectorsphosphoacetylationphosphodestructionphosphometabolitesphosphonodithioatephosphopentomutasephosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphotoconceptualismphotoconceptualistphotodecompositionphotoelectrographsphotoencapsulationphotoglottographicphotoheterotrophicphotoimmunotherapyphotoincorporationphotolithographersphotolithographingphotomorphogeneticphotonephelometersphoto␣opportunitiesphotoorganotrophicphotoperiodicitiesphotoperoxidationsphotoperturbationsphotopiezoelectricphotoplethysmogramphotoprecipitationphotoreproductionsphotorespirometersphotospectrometersphotospectrometricphotospectroscopicphotothermoplasticphototopographicalphototypographicalphysiopathologistsphytomorphologistsphytophototoxicityphytoplanktivorousphytoplankton␣bloomphytotopographicalpicophotoautotrophPoplar-Cotton␣Centerpostconceptionallypostdepositationalpostdepositionallypostpericardiotomypostpolymerizationpostrepolarizationpotato␣chip␣of␣the␣seapower␣of␣appointmentpreprosomatostatinproposition␣nationsprosperity␣theologyproteolipoproteinsprothoracicotropicprotoanthophylliteprotopsychologistsprototype␣extensionpsychopathologistsput␣someone's␣pipe␣outretrospectroscopesspectromorphometryspectrophotographsspectrophotographyspectrophotometersspectrophotometricspermatoproteasomespongiotrophoblaststereophotographerstereophotographicsymproportionationtelephone␣operatorsthiophosphorylatedthiopyrophosphatestriphosphorylationzosterophyllophyte

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