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There are 621 eighteen-letter words containing A, D, 2I, O and 2T

(page 4)

proprietary␣tradingprotocatechuic␣acidprotodesilylationsprotomitochondrialpseudoaristocraticpseudoarticulationpseudoelasticitiespseudoenthusiasticpseudoheritabilitypseudointeractionspseudomilitaristicpseudoquantitative pseudo-quantitativepseudoverticillatequadratic␣equationsquadratic␣functionsquadripartitioningquasidistributionsquattuordecillionsquodlibetificatingradial␣keratotomiesradiation␣chemistryradiation␣pyrometerradioactive␣datingsradioactive␣falloutradioactive␣tracersradioconcentrationradiocontaminationradiodensitometricradiodeterminationradiometric␣datingsradiosensitisationradiosensitivitiesradiosensitizationradiospectrometricradiosterilisationradiosterilizationradiotelegraphistsradiotherapeuticalradiotherapeutistsredifferentiationsred␣imported␣fire␣antreductio␣ad␣Hitlerumreductionisticallyrestandardizationsretroaldolizationsretrocycloadditionretrodifferentiateretrodimerizationsridden␣the␣coattailsriding␣the␣coattailsring␣down␣the␣curtainrotational␣moldingsrotational␣mouldinground-trip␣delay␣timesail␣close␣to␣the␣windSaint-Martin-le-Nœudsecondary␣intentionself-contradictionsself-identificationsemidiscretisationsemidiscretizationsemiphlogisticatedseparation␣of␣dutiesserodeterminationsset-builder␣notationshielding␣constantsshouting␣dictationsshuttle␣diplomaciessignal␣transductionsilicotungstic␣acidsit-and-wait␣predatorsitting␣one's␣ass␣downsitting␣on␣one's␣handssit␣up␣and␣take␣noticesix␣bob␣a␣day␣touristssodicanthophyllitesodiumthiosulphate sodium␣thiosulphatespectroradiometricspiritual␣desertionspondylarthritidesstandard␣definitionstandard␣deviationsstandard␣of␣identitystanding␣committeesstand␣on␣one's␣dignitystaphylinidologiststeam␣distillationsstencil␣duplicatorsstibiopalladinitesstock␣market␣indicesstraight␣as␣a␣soldierStratfield␣Mortimerstylohyoid␣ligamentsubadministrationssubdifferentiationsubordinationalistsulphotungstic␣acidsummability␣methodsSunnyside-Tahoe␣Citysuperadministratorsupersophisticatedswallow-tailed␣kitestake␣it␣into␣one's␣headtelluropalladiniteterahertz␣radiationterms␣and␣conditionstetracarbon␣dioxidetetracontanoic␣acidtetrahedralizationtetrahydropyridinetetrahydrotriazinetetraiodothyroninetetraploidisationstetraploidizationstetratricopeptidesThakurgaon␣Districtthaumatopsyllioidstherapeutic␣windowsthermodifferentialthermodilatometricthick-and-thin␣blocksthiobarbituric␣acidthiodigalactosidesThird␣Law␣of␣Roboticsthree-point␣landingsthrowing␣in␣the␣cardstime␣and␣motion␣studytin-pot␣dictatorshiptourist␣destinationtracheomediastinalTraditional␣Chinesetraditional␣climbertraditional␣studenttransaldiminationstransdeterminationtransgenderisationtransgenderizationtransglucosidationtransglycosidation

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