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There are 636 eighteen-letter words containing A, C, E, 2L and 2O

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osteomorphologicalovercollateralizedovercollateralizesoverlexicalizationovermultiplicationoveroptimisticallyp-acetylaminophenolpaedopsychologicalpalaeoclimatologicPalaeodicotyledonspalaeoecologicallypalaeoethnologicalpalaeogeographicalpalaeohistologicalpalaeohydrologicalpalaeoichnologicalpalaeolimnologicalpalaeomastologicalpalaeomicrobiologypalaeoneurologicalpalaeontographicalpalaeopathologicalpalaeophycologicalpale␣clouded␣yellows Pale␣Clouded␣Yellowspaleobiolinguisticpaleochronologicalpaleoclimatologistpaleodemographicalpaleoentomologicalpaleoglaciologicalpaleoichthyologistpaleomalacologicalpaleomalacologistspaleomyrmecologistpaleopalynologicalpaleophysiologicalpaleopsychologicalpaleornithologicalpaleoseismologicalpaleospinothalamicpaleotopographicalparabolic␣reflectorpeckerwood␣sawmillspentachloroanisolepentachlorophenolsperfluorochemicalspericonceptionallyphallologocentrismphenomenologicallyphenylchlorosilanephotoallergenicityphotocrosslinkablephotosyntheticallyphysicotheologicalpillow␣dictionariesplainclothespersonpolar␣covalent␣bondspolitical␣correctorpolitical␣economiespolitical␣economistpolitically␣correctpolitical␣prisonerspoliticocommercialpolyacrylonitrilespolychromatophilespolycontexturalitypolyfunctionalisedpolyfunctionalizedpolygalacturonasespolygalacturonatespolygon-circle␣graphpolymicrobacterialpolymolecularitiespolymorphocellularpolymorphonuclearspolymorphonucleatepolypharmacologiespolyphthalocyaninepolyvalerolactonespostconceptionallypostglacial␣reboundpotentiometricallypotentiostaticallyprecompositionallypretranslocationalprime␣constellationpro-vice-chancellorsprovisional␣licensepseudobiologicallypseudoetymologicalpseudolocalization pseudo-localizationpseudomultilocularpseudomythologicalpseudoneurologicalpseudopathologicalpsychoneurologicalpsychoneuroticallypsychophoneticallypsychosemioticallyquattuordecillionsradiculomyelopathyradiculoplexopathyradioactive␣falloutradio-controlled␣carradiological␣weaponraking␣over␣old␣coalsreprotoxicologicalRepublic␣of␣ColombiaRepublic␣of␣Sloveniaresidential␣schoolsrhamnosylglucosiderhamnosylglycosideribonucleoparticleroentgenologicallyrose-colored␣glassessail␣close␣to␣the␣windsaltwater␣crocodileschool-dinner␣ladies school␣dinner␣ladiesscleroconjunctivalsecond-level␣domainssecond-person␣pluralsedimentologicallyself-congratulationselfcongratulatory self-congratulatorysemiapologeticallyserodiagnosticallysialoglycopeptidessialoglycopolymerssialoglycoproteasesialoglycoproteinssialoglycoproteomesialylglycopolymersialylglycoproteinskull-and-crossbones skull␣and␣crossbonessocial␣evolutionismsocial␣psychologiessociopoliticolegalsociotechnologicalsodicanthophyllitespecial␣resolutionssplanchnoskeletonsstar␣macromoleculesstereohistologicalstereoisomericallystoichiometrically

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