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There are 139 eighteen-letter words containing 4O, P and 2R

adenocorticotropicallegro␣ma␣non␣troppoanthropomorphologyanthropomorphouslyautoregulatory␣loopBook␣of␣Common␣PrayerbromochloropropanebronchoprovocationbronchoprovocativechemoorganotrophicchlorophototrophicchloropyromorphitechondrodystrophoidchondroprogenitorschoriogonadotropinChorleywood␣processchromocollographicchromophotographicchronomentrophobiachronopharmacologychronophotographicchronopotentiogramcomparison␣operatorcompound␣proportioncomproportionatingcomproportionationcopromicroscopicalcoproparasitologiccoproparasitoscopycoproporphyrinogencorticomelanotrophcounterpropositioncrossed␣loop␣sensorscry␣from␣the␣rooftopsde␣facto␣corporationdisproportionationdithiolopyrrolonesecohydrogeomorphicfactor␣of␣productionfibrobronchoscopesfibrobronchoscopicground␣control␣pointharmonic␣proportionhydrogeomorphologyhydromorphologicalhypoosmoregulatorykaryomorphologicalknow␣from␣a␣bar␣of␣soaplaryngostroboscopelaryngostroboscopymacroconidiophoresmacromorphologicalmicroiontophoresismicroiontophoreticmicromorphologicalmitochondriotropicmonohydroperoxidesmore␣power␣to␣someonemore␣power␣to␣your␣armmorphoelectrotonicneuromorphologicalnonanthropomorphicnonproportionalityoctabromoporphyrinoligohypomenorrheaorders␣of␣operationsorganoheterotrophsorganoheterotrophyorganolithotrophicornithocheiromorphorthopantomographsorthopantomographyostarioclupeomorphosteoproliferationotoneuroprotectiveout␣of␣all␣proportionoverpronounciationoverproportionallyowners␣corporationspaleozoogeographerparacrocodylomorphperfluorononanoateperfluorooctanoateperonosporomycetespersons␣from␣Porlockphaerochromocytomaphosphoriboproteinphotochronographicphotodeteriorationphotofluorographicphotoheterotrophicphotoincorporationphotoorganotrophicphotoreproductionspin␣a␣rose␣on␣your␣nosepleurolophocercousportoenterostomiespostbronchodilatorposterodorsomedialposterodorsomedianpostorbitofrontalsproapolipoproteinsprocolophonomorphsprolonged␣abortionspromorphologicallypropiomelanocortinProsecco␣StormfrontproteolipoproteinsproteopolymersomesprothoracicotropicprotochlorophilideprotocoligoricallyprotoconversationsprotodeboronationsProto-Indo-Europeansprotomicrocotylidsprotomitochondrialprotomitochondrionprotomyofibroblastprotoporphyrinogenproximoposteriorlypseudoorthorhombicpyrophosphorolysispyrophosphorolyticradiomorphologicalreprotoxicologicalrhabdodontomorphanribonucleoproteomerose-colored␣pastorsrose-coloured␣pastorSoke␣of␣Peterboroughstereofluoroscopicstrontiopyrochloresymproportionationtephrochronologistthyrotropic␣hormonetrooping␣the␣colourszero-knowledge␣proofzoosporangiophores

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