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There are 60 eighteen-letter words containing 3D, I, O and S

adjustment␣disorderandrostadienedionebird␣dropping␣spiderbladder␣desperationBudd-Chiari␣syndromechondrodystrophoidcylindroleberididsdarkhorse␣candidatedelusional␣disorderdendrohydrologistsdeoxyuridylic␣acidsdepressive␣disorderdestination␣weddingdideoxynucleosidesdideoxynucleotidesdie␣a␣thousand␣deathsdihydrocodeineonesdihydropyrimidinesdihydrostilbenoidsdihydroxyacridinesdivides␣and␣conquersdjadochtatherioidsdodecadepsipeptidedollar␣of␣our␣daddiesdollar␣of␣the␣daddiesdouble␣standardistsdownward-facing␣dogsdrunk␣and␣disorderlyduck-billed␣dinosaurduodecanucleotidesdysdiadochocinesiadysdiadochokinesiadysdiadochokinesiseverybody␣and␣his␣doghidden␣Markov␣modelshide-and-die␣syndromeholding␣midfieldershydrogen␣disulphideicosidodecahedronsimidoendopeptidaseindustrial␣diamondsLedderhose's␣diseaselet's␣not␣and␣say␣we␣didmiddleoftheroaders middle-of-the-roadersoldfieldthomasiidspedophilic␣disorderpseudodisaccharidereductio␣ad␣absurdumreverse␣implied␣oddssaddle-billed␣storksside-blotched␣lizardsodium␣borohydridesstandard␣definitionstandard␣deviationsstandard␣of␣identitysulfonodiimidamideSussex␣pond␣puddingstwiddled␣one's␣thumbsvideoduodenoscopes

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