thrum htrum trhum rthum hrtum rhtum thurm hturm tuhrm uthrm hutrm uhtrm truhm rtuhm turhm utrhm ruthm urthm hrutm rhutm hurtm uhrtm ruhtm urhtm thrmu htrmu trhmu rthmu hrtmu rhtmu thmru htmru tmhru mthru hmtru mhtru trmhu rtmhu tmrhu mtrhu rmthu mrthu hrmtu rhmtu hmrtu mhrtu rmhtu mrhtu thumr htumr tuhmr uthmr hutmr uhtmr thmur htmur tmhur mthur hmtur mhtur tumhr utmhr tmuhr mtuhr umthr muthr humtr uhmtr hmutr mhutr umhtr muhtr trumh rtumh turmh utrmh rutmh urtmh trmuh rtmuh tmruh mtruh rmtuh mrtuh tumrh utmrh tmurh mturh umtrh mutrh rumth urmth rmuth mruth umrth murth hrumt rhumt hurmt uhrmt ruhmt urhmt hrmut rhmut hmrut mhrut rmhut mrhut humrt uhmrt hmurt mhurt umhrt muhrt rumht urmht rmuht mruht umrht murht
Note: these 'words' (valid or invalid) are all the permutations of the word thrum. These words are obtained by scrambling the letters in thrum.