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There are 444 eighteen-letter words containing 2I, 2O, P and 2S

(page 2)

in-school␣suspensioninsectivorous␣plantinstitute␣professorintermetamorphosisintrospectionisticintrospective␣sortsiron-sulfur␣proteinsisoelectrophoresisisonitroso␣compoundisosceles␣trapezoidisotopic␣signaturesisotransplantationjockeys␣for␣positionKerrison␣predictorsknights␣of␣the␣spigotlasiosphaeriaceouslepidopterologistsLeri's␣pleonosteosislipofuscinogenesislipogranulomatosislipoprotein␣lipaseslogical␣positivismslogical␣positivistsloose␣lips␣sink␣shipslumpenbourgeoisieslymphohistocytosislysosphingomyelinsmagnetodispersionsmesoionic␣compoundsmicrocosmographiesmicrodecompressionmicroiontophoresismicropatriologistsmicrorespirometersmicrospectroscopicmicrowhip␣scorpionsmisprognosticatingmisprognosticationmissionary␣positionmission␣impossiblesmissions␣impossibleMissouri␣toothpicksmonodispersabilitymultipolarisationsmultiprofessionalsmultispectroscopicnail-polish␣removers nail␣polish␣removersnano-decompositionsnarcodictatorshipsnatural␣isomorphismneoimpressionisticneurocristopathiesneuroleptospirosisneurophysiologistsneutrophilopoiesisniggers␣in␣woodpilesnoncompetitivenessnoncompressibilitynoncooperationistsnonprofessionalismno␣prize␣for␣guessingNorfolk␣Island␣pinesnorsesquiterpenoidoccipitotransverseoesophagostomiasisontoepistemologiesopisthobranchiatesopposition␣researchOppression␣Olympicsoptical␣microscopesorthopsychiatristsoverpressurisationoverpressurizationoversophisticationoverspecialisationoviraptorosaurianspalaeolimnologistspaleodistributionspaleonutritionistspaleornithologistspaleoseismologicalpaleoseismologistspalmar␣fibromatosispapillomatogenesispathophysiologistsPauline␣conversionspetite␣bourgeoisiespetro-dictatorshipspharyngotonsilitisphilosophers␣by␣firephilosophers␣of␣firephilosophies␣of␣mindphilosophunculistsphloroglucinolysisphosphoglycolipidsphosphoisoprenoidsphosphoselectivityphosphosensitivityphosphospecificityphotoassimilationsphotoconsistenciesphotocrosslinkingsphotodisintegratesphotodissociationsphotoisomerisationphotoselectivitiesphotosensitisationphotosensitivenessphotosensitivitiesphotosensitizationphotosubstitutionsphrasal␣prepositionphysiobiochemistryphysiopathogenesisphysiopathologistsphytophysiognomiesphytostabilisationpick␣someone's␣brainspicornavirologistspiezoimmunosensorspilosebaceous␣unitsPinocchio␣illusionspiriformis␣syndromeplastosemiquinonespolice␣commissionerpolitical␣commissarpolitical␣prisonerspolyvinylsiloxanespoor␣is␣a␣state␣of␣mindporprismacovirusespositional␣asphyxiaposition␣of␣strengthpositive␣transitionpostadministrationpostbehavioralistspostconstitutionalpostdepositationalpostdepositionallypostdiagnosticallypostilion␣sentencespost-impressionismspostimpressionistspostprecipitationspostquestionnairespostranscriptionalpoststratification

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