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There are 77 eighteen-letter words containing 2O, 3P, S and T

absorption␣pipettesalphaphotographicsaminopolypeptidaseChappuis␣absorptioncolpoperineoplastycommon␣hippopotamuscoproparasitoscopyexopolyphosphataseglucolipoapoptosisglycopeptidolipidshepatosplenographyhyperphosphorylatehypophosphataemiashypophosphatasemiahypophosphorylatedisopropylphosphatelepidopterophagouslipoprotein␣lipasesnonphosphopeptidespalaeopropithecidspale-spotted␣emperorpeptidoglycolipidspeptostreptococcalperoxodiphosphatespersonal␣propertiespharmacophenotypesphospholipoproteinphosphoneoepitopesphosphonopentanoicphosphonopyruvatesphosphopantetheinephosphopentomutasephosphoriboproteinphosphospecificityphotographic␣papersphotographic␣platesphoto␣opportunitiesphotophosphorylasephotospectroscopicphrasal␣prepositionPointe␣Coupee␣Parishpolyphosphorylatedpolyplethysmographpolysporangiophytepopping␣the␣questionpopulation␣pyramidspostprecipitationsprephosphorylatingprephosphorylationpreposition␣of␣placepresuppositionallypresuppositionlessprinter's␣apostropheproapolipoproteinsproazaphosphatraneproposition␣playersproprietary␣eponymsproteolipoproteinspseudohypertrophicpseudophosphatasespseudophotographicpseudophotospherespseudophylactocarppseudopsychopathicpsychic␣photographypsychoprophylacticput␣someone's␣pipe␣outpyrophosphorolyticpyrophosphorylatedpyrophosphorylyticrobs␣Peter␣to␣pay␣Paulsole␣proprietorshipspectrophotographsspectrophotographyspectropolariscopesphingophosphatidethiopyrophosphates

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