rebbe erbbe rbebe brebe ebrbe berbe rebbe erbbe rbebe brebe ebrbe berbe rbbee brbee rbbee brbee bbree bbree ebbre bebre ebbre bebre bbere bbere rebeb erbeb rbeeb breeb ebreb bereb reebb erebb reebb erebb eerbb eerbb rbeeb breeb rebeb erbeb bereb ebreb eberb beerb eebrb eebrb beerb eberb rebeb erbeb rbeeb breeb ebreb bereb reebb erebb reebb erebb eerbb eerbb rbeeb breeb rebeb erbeb bereb ebreb eberb beerb eebrb eebrb beerb eberb rbbee brbee rbbee brbee bbree bbree rbebe brebe rebbe erbbe berbe ebrbe rbebe brebe rebbe erbbe berbe ebrbe bbere bbere bebre ebbre bebre ebbre ebber beber ebber beber bbeer bbeer ebebr beebr eebbr eebbr beebr ebebr ebebr beebr eebbr eebbr beebr ebebr bbeer bbeer beber ebber beber ebber
Note: these 'words' (valid or invalid) are all the permutations of the word rebbe. These words are obtained by scrambling the letters in rebbe.