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There are 28 twenty-letter words containing F, L, N, 2R and 2U

antiferroquadrupolarantiferroquadrupolesargument␣from␣illusionarteriovenous␣fistulabuckminsterfullerenecircular␣firing␣squadsfasciculoventricularfrequency␣multipliershydrodesulfurisationhydrodesulfurizationhyperautofluorescentimmunofluororeactivelooks␣out␣for␣number␣one looks␣out␣for␣Number␣Onemicroultracentrifugenatural␣user␣interfacenitrosylsulfuric␣acidparainfluenzavirusesperfluorocyclobutaneperfluoroundecanoateSouth␣African␣Republicsuperfluous␣intervalssurface␣boundary␣layersurfaces␣of␣revolutionultracentrifugationsultramicrocentrifugeuniversal␣quantifiersuranium␣hexafluorides

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See this list for:

  • Scrabble in English: no word
  • French Wiktionary: 67 words
  • Spanish Wiktionary: no word
  • Italian Wiktionary: 5 words
  • German Wiktionary: 100 words
  • Portuguese Wiktionary: no word
  • Dutch Wiktionary: 7 words

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