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There are 520 eighteen-letter words containing 4O and R

(page 3)

oesophagobronchialoff-off-off-Broadwaysoligodendrocytomasoligodendrogliomaloligodendrogliomasoligodendrogliosisoligofractionationoligohymenophoreanoligohypomenorrheaoligooxopiperazineon␣a␣collision␣courseoncoproteogenomicsone␣for␣all,␣all␣for␣oneon␣someone's␣doorstepophthalmotonometryopisthomonorchiineoportuzumab␣monatoxorders␣of␣knighthoodorders␣of␣operationsorganoboronic␣acidsorganoheterotrophsorganoheterotrophyorganolithotrophicorganopathologicalorganophosphonatesOriental␣Orthodoxesornithocheiromorphorthoconglomeratesorthogonal␣functionorthogonalisationsorthogonalizationsorthokeratologicalorthonormalisationorthonormalizationorthopantomographsorthopantomographyorthopneic␣positionorthoroentgenogramostarioclupeomorphosteoarchaeologistosteoarcheologicalosteoarcheologistsosteochemonecrosisosteochondroblastsosteochondromatousosteochondropathiaosteochondrophytesosteochondroplastyosteomorphologicalosteoproliferationosteoradionecrosisosteoradionecroticOstrogothic␣Kingdomotomicroscopicallyotoneuroprotectiveout␣of␣all␣proportionoverpronounciationoverproportionallyowners␣corporationspalaeoanthropology palæoanthropologypalaeohydrogeologypalaeomicrobiologypaleochronologicalpaleogeomorphologypaleozoogeographerpanproctocolectomyparacrocodylomorphpathomorphologicalperfluorononanoateperfluorooctanoateperiodontopathogenperonosporomycetesperoxomonosulfatespersons␣from␣Porlockphaeochromocytomasphaerochromocytomapharmacotoxicologypheochromocytomataphosphoisoprenoidsphospholipoproteinphosphonoglycerolsphosphorecognitionphosphoriboproteinphosphorodithioatephosphorothioationphosphorothiolatedphosphorothiolatesphotobiomodulatoryphotochlorinationsphotochronographicphotodecolourationphotodeteriorationphotoelectromotivephotofluorographicphotogeomorphologyphotoglottographicphotoheterotrophicphotoincorporationphotoisomerisationphotoisomerizationphotomorphogenesisphotomorphogeneticphotomorphologicalphoto␣opportunitiesphotoorganotrophicphotoperoxidationsphotophosphorylasephotorecombinationphotoreproductionsphotospectroscopicphototopographicalphytomorphologicalphytomorphologistspicophotoautotrophpin␣a␣rose␣on␣your␣nosepleurolophocercouspneumocolonographypolydolopimorphianpolyphloroglucinolportoenterostomiespositive␣lookaroundpostbronchodilatorpostcommissurotomyposterodorsomedialposterodorsomedianpostorbitofrontalsproapolipoproteinsprocolophonomorphsprolonged␣abortionspromorphologicallypropiomelanocortinpropositional␣logicproposition␣nationsProsecco␣StormfrontproteolipoproteinsproteopolymersomesprothoracicotropicprotochlorophilideprotocoligoricallyprotoconversationsprotodeboronationsProto-Indo-Europeansprotomicrocotylidsprotomitochondrialprotomitochondrionprotomyofibroblastprotoporphyrinogenprotopsychologicalprotopsychologistsproximoposteriorlypseudoorthorhombic

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