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There are 72 eighteen-letter words containing I, O, P, 2R and 2U

acardiacus␣amorphusauriculotherapistsautomorphic␣numbersautomorphism␣groupsauxiliary␣power␣unitBordeaux␣turpentinebrute␣for␣punishmentburden␣of␣persuasionburden␣of␣productioncapitulotubercularcountertherapeuticdesupersaturationsexecutive␣producersfibrinosuppurativeflying␣saucer␣groupsfuture␣progressiveshydrosulphuric␣acidimmunofluorographsimmunofluorographyiron-sulfur␣proteinsiron-sulphur␣clusteriron-sulphur␣proteinlabium␣superius␣orisminisupercomputersmultineurotrophinsneighbouring␣groupsnon-capturing␣groupsnonsupernaturalistorthopneumovirusesouter␣automorphismspachypleurosauridsPaisley␣Undergroundpart␣of␣the␣furnitureperiodic␣structurespleuroperipneumonyPortuguese␣Republicpoststructuralismspoststructuralistsproscenium␣curtainspseudodiverticularpseudotumor␣cerebripurulent␣bronchitisradiculoneuropathyreligious␣pluralismRepublic␣of␣BulgariaRepublic␣of␣ParaguayRepublic␣of␣Surinameresumptive␣pronounsRuffini's␣corpusclesRusso-European␣Laikasculptured␣tortoisesecurity␣proceduressexual␣reproductionsourtop␣blueberriesstabilizer␣subgroupsudoriparous␣glandssupercommunicatorssupercounterfluidssuperdistributionssuperferociousnesssuperhero␣insurancesuperior␣colliculussupermicrocomputersupermicrosurgicalsuperminicomputerssupramicrosurgicalsupranutritionallysurgical␣proceduresturbosuperchargingturpentine␣of␣CyprusundersubscriptionsYour␣Worshipfulness

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