bcfv cbfv bfcv fbcv cfbv fcbv bcvf cbvf bvcf vbcf cvbf vcbf bfvc fbvc bvfc vbfc fvbc vfbc cfvb fcvb cvfb vcfb fvcb vfcb
Note: these 'words' (valid or invalid) are all the permutations of the word bcfv. These words are obtained by scrambling the letters in bcfv.