bells eblls blels lbels elbls lebls bells eblls blels lbels elbls lebls blles lbles blles lbles llbes llbes ellbs lelbs ellbs lelbs llebs llebs belsl eblsl blesl lbesl elbsl lebsl besll ebsll bsell sbell esbll sebll blsel lbsel bslel sblel lsbel slbel elsbl lesbl eslbl selbl lsebl slebl belsl eblsl blesl lbesl elbsl lebsl besll ebsll bsell sbell esbll sebll blsel lbsel bslel sblel lsbel slbel elsbl lesbl eslbl selbl lsebl slebl bllse lblse bllse lblse llbse llbse blsle lbsle bslle sblle lsble slble blsle lbsle bslle sblle lsble slble llsbe llsbe lslbe sllbe lslbe sllbe ellsb lelsb ellsb lelsb llesb llesb elslb leslb esllb sellb lselb slelb elslb leslb esllb sellb lselb slelb llseb llseb lsleb slleb lsleb slleb
Note: these 'words' (valid or invalid) are all the permutations of the word bells. These words are obtained by scrambling the letters in bells.