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There are 370 eighteen-letter words containing O, 2P, R and 2S

absorption␣pipettesabsorption␣spectrumacute-phase␣proteinsad-hoc␣polymorphismsaminotripeptidasesamphisphaeriaceousa␣promise␣is␣a␣promiseAshley's␣stopper␣knotastrophotographersathletic␣supportersautomorphism␣groupsautophosphorylatesBaldwin's␣phosphorusbiological␣passportbiometric␣passportsbiophosphorescencebiopsychospiritualbiphosphorylationsBononian␣phosphorusbootstrap␣paradoxesbrown␣paper␣bag␣testsbrownseed␣paspalumscephalaspidomorphsChappuis␣absorptioncheats␣never␣prosperchlorosulpholipidscomparison␣shopperscomparison-shopping comparison␣shoppingcomposite␣particlescompulsory␣purchasecomputer␣processorsconstruction␣papersCoppersmith's␣attackCoppersmith's␣methodcoproparasitoscopycorrespondentshipscounteroppositionscreatine␣phosphatescylindrospermopsindephosphorylationsdepositary␣receiptsdepressor␣septi␣nasidiisopropylphenylsdiphosphohydrolasediphosphorylationsdrepanosauromorphsdystrophinopathieseditiones␣principesepitranscriptomicsEppstein's␣algorithmergasiophygophytesEsopus␣Spitzenburgseustreptospondylusevapotranspiratorsexpression␣templatefirst-person␣pluralsfluorophosphonatesglycerolphosphatesglycerophosphatasegrasshopper␣warblerhanging␣up␣one's␣spurshappy␣as␣a␣box␣of␣birdshapsidopareiontidshelping␣professionshemispermatophoresHippocrates␣sleeves Hippocrates'␣sleevesHittorf's␣phosphorusHomberg's␣phosphorushope␣springs␣eternalhydrolaparoscopieshydropolysulphideshypercompensationshypereosinophiliashyperesponsivenesshyperlymphocytosishypermetamorphoseshypermetamorphosishyperparakeratosishyperphosphaturiashyperpolarisationshypersomatotropismhypersophisticatedhyperspectrometershypochondroplasiashyporesponsivenesshyposulphurous␣acidhypsiprymnodontidsimmunosuppressantsimmunosuppressionsimmunosuppressivesimpersonal␣passivesinner␣product␣spacesisopropylethylenesisopropylphosphateJapanese␣persimmonskeeps␣one's␣powder␣drykleptochloroplastslepidopterologistsleptosphaeriaceouslevodoparesponsivelipoprotein␣lipaseslymphocytapheresismapping␣class␣groupsmicrospectroscopesmicrospectroscopicmicrowhip␣scorpionsminisupercomputersmorphophonologistsmultispectroscopicnasopharyngoscopesnephropathogenesisnephropathologistsneuroleptospirosisneuropsychopathiesneutrophilopoiesisnonsuppressibilityopportunity␣classesopposition␣researchOppression␣Olympicsoptical␣microscopesorganophosphatasesorganophosphonatesOrtsgruppenleitersoysterman's␣stopperspachypleurosauridspaper␣scissors␣stoneparallel␣postulatesparallel␣transportsparaprofessionallyparasympatholyticsparish␣pump␣politicsparty␣and␣party␣costsPatagonia␣cypressespathomorphogenesispaying␣one's␣respectspectoral␣sandpiperspedostratigraphiespeople's␣democraciesperonosporomycetesperoxodiphosphatespersonal␣properties

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