cohen ochen choen hcoen ohcen hocen coehn ocehn ceohn ecohn oechn eochn cheon hceon cehon echon hecon ehcon ohecn hoecn oehcn eohcn heocn ehocn cohne ochne chone hcone ohcne hocne conhe ocnhe cnohe ncohe onche noche chnoe hcnoe cnhoe nchoe hncoe nhcoe ohnce honce onhce nohce hnoce nhoce coenh ocenh ceonh econh oecnh eocnh coneh ocneh cnoeh ncoeh onceh noceh cenoh ecnoh cneoh nceoh encoh necoh oench eonch onech noech enoch neoch cheno hceno cehno echno hecno ehcno chneo hcneo cnheo ncheo hnceo nhceo cenho ecnho cneho nceho encho necho henco ehnco hneco nheco enhco nehco ohenc hoenc oehnc eohnc heonc ehonc ohnec honec onhec nohec hnoec nhoec oenhc eonhc onehc noehc enohc neohc henoc ehnoc hneoc nheoc enhoc nehoc
Note: these 'words' (valid or invalid) are all the permutations of the word cohen. These words are obtained by scrambling the letters in cohen.