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There are 374 eighteen-letter words containing I, 4O and R

(page 3)

prothoracicotropicprotochlorophilideprotocoligoricallyprotoconversationsprotodeboronationsProto-Indo-Europeansprotomicrocotylidsprotomitochondrialprotomitochondrionprotomyofibroblastprotoporphyrinogenprotopsychologicalprotopsychologistsproximoposteriorlypseudoorthorhombicpseudoprotodioscinptilochronologicalpyrophosphorolysispyrophosphorolyticpyropoikilocytosisradiochronologicalradiomorphologicalradiotoxicologicalrectosigmoidoscopyrenohistopathologyreprotoxicologicalrestoration␣ecologyribonucleoproteomerootinest␣tootinest rootin'est␣tootin'estsalpingooophoritis salpingo-oophoritissclerochronologiesseroepizootiologicsialoglycoproteomeskeletochronologicskotomorphogenesissocial␣anthropologysociochronobiologysocioendocrinologysolenofilomorphidssolids␣of␣revolutionsomatoform␣disordersomatomammotropinssomatosensorimotorsopranino␣saxophonesoprano␣saxophonistsoprillo␣saxophonesspoil␣someone␣rottenspongiotrophoblaststereofluoroscopicstrontiopyrochloresulfoniopropionatesymproportionationtephrochronologistthermoconformationthermophotovoltaicthink-aloud␣protocol think␣aloud␣protocolthrombocytopoiesisthrombocytopoieticthyrotropic␣hormonetocopherolquinonestoo␣big␣for␣one's␣bootstoo␣much␣informationtopoisomerizationstoxicopharmacologytrooping␣the␣colourstwo-point␣conversionVerbano-Cusio-Ossolavideobronchoscopesvideostroboscopieszoopharmacologicalzoosporangiophores

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