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There are 63 twenty-letter words containing E, F, I, N, R and 2U

antiferroquadrupolarantiferroquadrupolesargument␣from␣illusionarteriovenous␣fistulabuckminsterfullerenebuffalobur␣nightshade buffalo-bur␣nightshadecardiofaciocutaneouscentury␣of␣humiliationcircumlocution␣officecoimmunofluorescencecyberinfrastructuresdifferential␣calculusDunning-Kruger␣effectsequipotential␣surfacefamous␣for␣being␣famousfasciculoventricularforum␣selection␣clausefrequency␣modulationsfrequency␣multipliersget␣blood␣out␣of␣a␣turnipglutton␣for␣punishmenthydrodesulfurisationhydrodesulfurizationimmunofluoropositiveimmunofluororeactiveimperfect␣subjunctiveinaequihymeniiferousIndus␣Valley␣bullfrogsin␣partibus␣infideliumMaisonneuve␣fracturesmake␣a␣production␣out␣ofmediums␣of␣instructionmicroultracentrifugenatural␣user␣interfaceobstruction␣of␣justiceparainfluenzavirusespublic␣health␣funeralsquantum␣field␣theoriesRepublic␣of␣South␣SudanRepublic␣of␣Uzbekistanrequest␣for␣productionrufous-backed␣antvireorunning␣off␣at␣the␣mouthselenium␣hexafluoridesesquiple␣first␣cousinshoulder-of-mutton␣sailSouth␣African␣Republicsuperfluous␣intervalssurfaces␣of␣revolutiontumour␣necrosis␣factorturn␣around␣one's␣fingerultracentrifugationsultrafundamentalistsultramicrocentrifugeUnited␣States␣of␣Europeuniversal␣quantifiersuniverses␣of␣discourseunqualified␣prospectsunsaturated␣fatty␣aciduranium␣hexafluoridesuser-defined␣functionsyouthful␣indiscretion

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