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There are 407 eighteen-letter words containing I, O, 2P and 2S

absorption␣pipettesabsorption␣spectrumacute-phase␣proteinsadenosine␣phosphatead-hoc␣polymorphismsaminophospholipidsaminotripeptidasesamphisphaeriaceousantipopulationistsapple␣dumpling␣shopsa␣promise␣is␣a␣promiseathletic␣supportersautolipophagosomesautomorphism␣groupsBaldwin's␣phosphorusbiological␣passportbiometric␣passportsbiophosphorescencebiopsychospiritualbiphosphorylationsBononian␣phosphoruscephalaspidomorphsChappuis␣absorptionchlorosulpholipidscomparison␣shopperscomparison-shopping comparison␣shoppingcomposite␣particlesconstruction␣papersCoppersmith's␣attackCoppersmith's␣methodcoproparasitoscopycorrespondentshipscounteroppositionscreatine␣phosphatescyclodepsipeptidescylindrospermopsindephosphonylationsdephosphorylationsdepositary␣receiptsdepressor␣septi␣nasidiisopropylphenylsdiphenylphosphidesdiphenylphosphinesdiphosphohydrolasediphosphoinositidediphosphorylationsdomestic␣appliancesdystrophinopathieseditiones␣principeseosinophilopoiesisepitranscriptomicsEppstein's␣algorithmergasiophygophytesEsopus␣Spitzenburgsevapotranspiratorsexpression␣templatefirst-person␣pluralsglucolipoapoptosisglucosphingolipidsglycophospholipidsglycosphingolipidshanging␣up␣one's␣spurshappy␣as␣a␣box␣of␣birdshapsidopareiontidshelping␣professionshemispermatophoreshepatopathogenesishepatopathologistsHippocrates␣sleeves Hippocrates'␣sleevesHittorf's␣phosphorushope␣springs␣eternalhydrolaparoscopieshydropolysulphideshypercompensationshypereosinophiliashyperesponsivenesshyperlymphocytosishypermetamorphosishyperparakeratosishyperphosphaturiashyperpolarisationshypersomatotropismhypersophisticatedhypochondroplasiashypophosphataemiashypophosphatasemiahyporesponsivenesshyposulphite␣of␣sodahyposulphurous␣acidhypsiprymnodontidsimmunosuppressantsimmunosuppressionsimmunosuppressivesimpersonal␣passivesinner␣product␣spacesinsipid␣schizotypalisopropylethylenesisopropylphosphateJapanese␣persimmonskeeping␣one's␣pants␣onkeep␣one's␣lips␣sealedkeeps␣it␣in␣one's␣pantskept␣one's␣lips␣sealedlepidopterologistsleptosphaeriaceouslevodoparesponsivelipophosphoglycanslipoprotein␣lipaseslongspine␣snipefishloose␣lips␣sink␣shipslymphocytapheresislysophosphatidateslysophospholipasesmagnesium␣phosphatemapping␣class␣groupsmicrospectroscopesmicrospectroscopicmicrowhip␣scorpionsminisupercomputersmonophosphokinasesmonothiophosphatesmorphophonologistsmultiple␣expansionsmultispectroscopicnephropathogenesisnephropathologistsneuroleptospirosisneuropsychopathiesneutrophilopoiesisnonphosphopeptidesnonsuppressibilitynostocyclopeptidesOmphalos␣hypothesisopportunity␣classesopposition␣researchOppression␣Olympicsopsonophagocytosisoptical␣microscopesOrtsgruppenleitersoutside␣passed␣pawnspachypleurosauridspaedopsychologists

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