bench ebnch bnech nbech enbch nebch becnh ebcnh bcenh cbenh ecbnh cebnh bnceh nbceh bcneh cbneh ncbeh cnbeh encbh necbh ecnbh cenbh ncebh cnebh benhc ebnhc bnehc nbehc enbhc nebhc behnc ebhnc bhenc hbenc ehbnc hebnc bnhec nbhec bhnec hbnec nhbec hnbec enhbc nehbc ehnbc henbc nhebc hnebc bechn ebchn bcehn cbehn ecbhn cebhn behcn ebhcn bhecn hbecn ehbcn hebcn bchen cbhen bhcen hbcen chben hcben echbn cehbn ehcbn hecbn chebn hcebn bnche nbche bcnhe cbnhe ncbhe cnbhe bnhce nbhce bhnce hbnce nhbce hnbce bchne cbhne bhcne hbcne chbne hcbne nchbe cnhbe nhcbe hncbe chnbe hcnbe enchb nechb ecnhb cenhb ncehb cnehb enhcb nehcb ehncb hencb nhecb hnecb echnb cehnb ehcnb hecnb chenb hcenb ncheb cnheb nhceb hnceb chneb hcneb
Note: these 'words' (valid or invalid) are all the permutations of the word bench. These words are obtained by scrambling the letters in bench.