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There are 132 eighteen-letter words containing D, I, O, 2P and 2S

adenosine␣phosphatead-hoc␣polymorphismsaminophospholipidsaminotripeptidasesapple␣dumpling␣shopsBaldwin's␣phosphoruscephalaspidomorphschlorosulpholipidsCoppersmith's␣methodcorrespondentshipscyclodepsipeptidescylindrospermopsindephosphonylationsdephosphorylationsdepositary␣receiptsdepressor␣septi␣nasidiisopropylphenylsdiphenylphosphidesdiphenylphosphinesdiphosphohydrolasediphosphoinositidediphosphorylationsdomestic␣appliancesdystrophinopathieseditiones␣principesglucosphingolipidsglycophospholipidsglycosphingolipidshappy␣as␣a␣box␣of␣birdshapsidopareiontidshydrolaparoscopieshydropolysulphideshypersophisticatedhypochondroplasiashyposulphite␣of␣sodahyposulphurous␣acidhypsiprymnodontidsinner␣product␣spacesinsipid␣schizotypalkeep␣one's␣lips␣sealedkept␣one's␣lips␣sealedlepidopterologistslevodoparesponsivelysophosphatidatesnonphosphopeptidesnostocyclopeptidesoutside␣passed␣pawnspachypleurosauridspaedopsychologistspayload␣specialistspectoral␣sandpiperspedostratigraphiespeople's␣democraciesperoxodiphosphatespetro-dictatorshipsphilosophies␣of␣mindphosphatidylserinephosphodestructionphosphodiesterasesphosphofluoridatesphosphoglycolipidsphosphoisoprenoidsphosphonucleosidesphosphonucleotidesphosphoribosylatedphosphosaccharidespolydispersibilitypolydispersivitiespolyphenoloxidasespostdepositationalpostdepositionallypostencephalitidespotassium␣feldsparspredispositionallypretermitted␣spousePrince␣Rupert's␣dropsProgress␣Pride␣flagspseudoappendicitispseudocapacitancespseudohypertensionpseudoimprovementspseudometaphysicalpseudo-participialspseudophacodonesispseudophakodonesispseudophilosopherspseudophilosophiespseudoprofessional pseudo-professionalpseudoprogressivespseudoprotodioscinpseudopsychologiespseudopsychopathicpseudopterostigmaspseudoreplicationspseudo-scholarshipspseudoxyrhophiinespseudozygopleuridspyrophosphoramidesrespondeat␣superiorSanfilippo␣syndromesecondary␣phosphinesesquipedalophobiasharp-tailed␣sparrowsialoglycopeptidessnapped␣one's␣fingerssolitary␣sandpipersspecial␣proceedingssphingoglycolipidssphingophosphatidespinous␣spider␣crabsspiroplectamminidsspondylodysplasticspondyloepiphysealspondylotherapistsSportsman's␣Paradisespot-billed␣pelicansspurious␣diphthongsstop-and-go␣penaltiesstriped␣swampdragonsulfoglycopeptidessupersophisticatedSussex␣pond␣puddingssympathetic␣powderstenoepiphysiodesisthird-person␣pluralstriphosphoric␣acidstropical␣depressionupdating␣one's␣priorsUpper␣Assam␣Divisionvery␣special␣episodeyellow␣lady's␣slipper

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