usbet subet ubset buset sbuet bsuet usebt suebt uesbt eusbt seubt esubt ubest buest uebst eubst beust ebust sbeut bseut sebut esbut besut ebsut usbte subte ubste buste sbute bsute ustbe sutbe utsbe tusbe stube tsube ubtse butse utbse tubse btuse tbuse sbtue bstue stbue tsbue btsue tbsue usetb suetb uestb eustb seutb esutb usteb suteb utseb tuseb stueb tsueb uetsb eutsb utesb tuesb etusb teusb setub estub steub tseub etsub tesub ubets buets uebts eubts beuts ebuts ubtes butes utbes tubes btues tbues uetbs eutbs utebs tuebs etubs teubs betus ebtus bteus tbeus etbus tebus sbetu bsetu sebtu esbtu bestu ebstu sbteu bsteu stbeu tsbeu btseu tbseu setbu estbu stebu tsebu etsbu tesbu betsu ebtsu btesu tbesu etbsu tebsu
Note: these 'words' (valid or invalid) are all the permutations of the word usbet. These words are obtained by scrambling the letters in usbet.