umble muble ubmle bumle mbule bmule umlbe mulbe ulmbe lumbe mlube lmube ublme bulme ulbme lubme blume lbume mblue bmlue mlbue lmbue blmue lbmue umbel mubel ubmel bumel mbuel bmuel umebl muebl uembl eumbl meubl emubl ubeml bueml uebml eubml beuml ebuml mbeul bmeul mebul embul bemul ebmul umleb muleb ulmeb lumeb mlueb lmueb umelb muelb uemlb eumlb meulb emulb ulemb luemb uelmb eulmb leumb elumb mleub lmeub melub emlub lemub elmub ublem bulem ulbem lubem bluem lbuem ubelm buelm ueblm eublm beulm ebulm ulebm luebm uelbm eulbm leubm elubm bleum lbeum belum eblum lebum elbum mbleu bmleu mlbeu lmbeu blmeu lbmeu mbelu bmelu meblu emblu bemlu ebmlu mlebu lmebu melbu emlbu lembu elmbu blemu lbemu belmu eblmu lebmu elbmu
Note: these 'words' (valid or invalid) are all the permutations of the word umble. These words are obtained by scrambling the letters in umble.