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There are 112 eighteen-letter words containing 2I, O and 4S

allosensitisationsanaesthesiologistsantiaggressionistsartists'␣impressionsAscension␣IslandersAssisi␣embroideriesassumes␣the␣positionasteroseismologistastrogeophysicistsautassassinophiliaautosuggestionistsbusiness-to-businessbusinessworthinessChristmas␣stockingsclassificationistscommissionairessescommissuroplastiesconsensualisationsconsensus␣realitiesconsubstantialistscrisis␣response␣teamcross-site␣scriptingdebtor␣in␣possessiondeconfessionalisesdefinitionlessnessdepressor␣septi␣nasidisassortativenessdispensationalistsdispersionlessnessdistortionlessnessgeneralissimoshipsGlissonian␣capsuleshairdressing␣salonshelioseismologistshostile␣possessionshyposensitisationsimmunosuppressionsimmunosuppressivesimpersonal␣passivesimpressionablenessincompressiblenessinconclusivenessesinfectious␣diseasesinflectionlessnessin-school␣suspensionisosceles␣triangleskinesthesiologistskissed␣someone's␣ringkisses␣someone's␣ringkissing␣someone's␣asskissing␣someone's␣hemLangford's␣basilisks Langford's␣Basiliskslegislative␣sessionLeri's␣pleonosteosisloose␣lips␣sink␣shipsmake␣it␣one's␣businessmicroabscessationsmisclassificationsmissclassificationmission␣impossiblesmissions␣impossiblemotivationlessnessmultifariousnessesneurotransmissionsoesophagostomiasisoverfastidiousnessoverpermissivenessoversolicitousnesspaleoseismologistspermissionlessnessphotosensitivenesspiscirickettsiosispossessive␣suffixespost-impressionismspostimpressionistspreassociativenesspresuppositionlessprismatic␣compassesprocessus␣mastoideipsychosociologistsradiosensitivenessradiotransmissionsSaffir-Simpson␣scalesecessionisticallysecondary␣emissionsserving␣suggestionsSillem's␣rosefinchessitting␣one's␣ass␣downsneaking␣suspicionssociopsychologistsspinous␣spider␣crabsspontaneous␣fissionState␣of␣Mississippisubclassificationssubspecialisationssubstantivisationssupposititiousnesssurvivorship␣biasestransitionlessnesstransmission␣mountstransmission␣towerstransversospinalisUgandan␣discussionsundisputatiousnessunprofessionalisesunprofessionalismsunsatisfactorinessupstairs-downstairsvisiting␣professorswaste␣disposal␣unitswrongful␣dismissals

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