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There are 4871 eighteen-letter words containing 2I and S

abdominal␣gestationabdominal␣migrainesabductive␣reasoningabsentia␣epilepticaabsolute␣deviationsabsolute␣humiditiesabsolute␣impedimentabsolute␣majoritiesabsolute␣privilegesabsorbing␣oneself␣inabsorption␣costingsabsorption␣pipettesabstention␣doctrineabstractificationsabuses␣of␣discretionAbyssinian␣primroseacanthocephaliasisaccession␣countriesaccessorial␣serviceaccommodation␣billsaccounting␣machinesaccreditation␣millsaccretionary␣prismsaccumulation␣pointsaceruloplasminemiaacetylisoquinolineacid-base␣equilibriaacid-base␣indicatorsacidostabilizationacoustic␣bass␣guitaracoustic␣guitaristsacousticolateralisactinotherapeuticsactions␣at␣a␣distanceactivation␣analysesactivation␣analysisactivation␣energiesactive␣vocabulariesacyloxazolidinonesadditive␣identitiesadditive␣operationsadds␣insult␣to␣injuryadenosylmethionineadhesive␣capsulitisadiabatic␣lapse␣rateadjournment␣sine␣dieadministrativenessadministratorshipsadministratrixshipadverbial␣genitivesadverbial␣particlesAegis␣class␣cruisersaequihymeniiferousaerotriangulationsaesthetic␣surgeriesaffective␣disordersaffine␣combinationsaffirmative␣actionsaffirmative␣defenseAfrican␣hunting␣dogsAfricoon-Americoons Africoon␣Americoonsafroinsectiphilianagreeing␣to␣disagreeagronanofungicidesagrosilvofisheriesahaptoglobinaemiasair␣admittance␣ventsair-cushion␣vehicles air␣cushion␣vehiclesairspeed␣indicatorsaldohexuronic␣acidsAlexandrian␣Wiccansalgebraic␣equationsalgebraic␣extensionalgebraic␣functionsalgebraic␣notationsalgebraic␣varietiesAlice-in-Wonderlands Alice␣in␣WonderlandsAlices-in-Wonderland Alices␣in␣Wonderlandalkaline␣hydrolysisalkanesulfonic␣acidalkoxycyclizationsalkylcarbodiimidesall␣but␣dissertationall␣one's␣life␣is␣worthallosensitisationsall-points␣bulletinsall␣politics␣is␣localall-terrain␣vehiclesalpine␣snowboardingalternate␣historiesalternative␣historyaltruistic␣filicidealuminium␣silicatesaluminum␣hydroxidesalumni␣associationsAmazonian␣antshrikeAmerican␣alligatorsAmerican␣as␣apple␣pieAmerican␣Eskimo␣DogsAmerican␣paddlefishAmerican␣ShorthairsAmerican␣snakebirdsamidinopiperidinesamidinotransferaseaminoacetonitrilesaminoalkynylationsaminocephalosporinaminocyclohexitolsaminodocosanediolsaminoeicosanetriolaminohexanoic␣acidsaminonicotinamidesaminophospholipidsaminopolypeptidaseaminosalicylic␣acidaminostratigraphicaminotransaminasesaminotripeptidasesamortisseur␣windingamphignathodontidsamphisphaeriaceousanaesthesiologicalanaesthesiologistsanagrammatisationsanagrammatizationsanalysis␣of␣varianceanalytic␣philosophyanarchist␣communismanarchist␣communistanarchist␣feminismsanarchist␣feministsanarcho-capitalismsanarchocapitalists anarcho-capitalistsanarcho-nationalism

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