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There are 731 eighteen-letter words containing H, 2I and 2R

(page 5)

pyrophosphoric␣acidpyrrolidinophenoneRabin-Karp␣algorithmradiation␣chemistryradiation␣hardeningradiochronologicalradiocinematographradiohumeral␣jointsradioimmunotherapyradiomorphologicalradiotelegraphistsradiotherapeuticalradiotherapeutistsraffinosaccharidesraise␣unshirted␣hellRayleigh␣scatteringreaped␣the␣whirlwindrecatheterizationsrecharacterisationrecharacterizationrechristianizationred-billed␣leiothrixRed-Letter␣Christianred␣light,␣green␣lightreductio␣ad␣HitlerumRegulation␣Charliesrepresentativeshipreproductive␣rightsresynchronisationsresynchronizationsrhetorical␣questionRhodesian␣Ridgebackrhombitrihexagonalring␣down␣the␣curtainring␣of␣the␣fishermanrobin-run-in-the-hedgeRobinson␣arithmeticromantic␣friendshiprule␣with␣a␣rod␣of␣ironrunning␣for␣the␣hillsruthenium␣tetroxideSaharanpur␣DivisionSakurajima␣radishessaurornitholestineSchrodinger␣kittens Schrödinger␣kittensSchrodinger's␣kitten Schrödinger's␣kittenSchroedinger␣kittenSchwarzschild␣radiiscientific␣researchscimitar-horned␣oryxscleractiniamorphsScotch␣marine␣boilerseismocardiographysemicharacteristicsensoribehaviouralsets␣one's␣hair␣on␣fireShanghai␣hairy␣crabsShariatpur␣DistrictSheridan's␣threadfinshrinkwrap␣licenses shrink-wrap␣licensesSiberian␣rubythroatsignature␣authoritysocial␣partnershipssodium␣borohydridessole␣proprietorshipSophie␣Germain␣primeSouthern␣Californiaspherical␣harmonicsspherical␣trianglesspiral␣of␣Archimedesspirits␣of␣hartshornspondylarthritidesstereolithographicstereoradiographicstraight␣as␣a␣soldierstranger␣in␣the␣nightsubcharacteristicssuperstoichiometrysupradiaphragmaticsurvivorship␣biasessynchronized␣diverssyringohydromyeliaterahertz␣radiationterminal␣bronchioletertiary␣phosphinestetrahedralizationtetrahydropyridinetetrahydrotriazinetetraiodothyronineThakurgaon␣Districttheory␣of␣relativitythermalgravimetricthermodifferentialthermodilatometricthermoirreversiblethermoplastic␣resinthermoreflectivitythermoresponsivitythin-film␣transistorthiobarbituric␣acidthiocarbohydrazidethird␣freedom␣rightsThird␣Law␣of␣Roboticsthird␣time's␣the␣charmthree-minute␣warningthrowing␣in␣the␣cardsThunder␣Bay␣Districttime␣is␣a␣great␣healertitan␣primary␣schooltransdiaphragmatictranshistoricizingtransmitochondrialtriakisoctahedronstrichlormethiazidetrichlorobiphenylstrichlorodiphenylstrichostrongyloidstrichostrongylosistrifluorothymidinetrihexosylceramidetrihydroxystilbenetrimethylpyridinestriphosphoric␣acidstriphosphorylationtriple␣witching␣hourtriskaidecahedronstriskaidekahedronsultramicrochemicalultramicrochemistsunder␣the␣impressionunitary␣authoritiesuniversal␣morphismsuntil␣further␣noticeureterolithotomiesureterolithotripsy

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