tratu rtatu tartu atrtu rattu arttu trtau rttau ttrau ttrau rttau trtau tatru attru ttaru ttaru attru tatru rattu arttu rtatu tratu atrtu tartu traut rtaut tarut atrut ratut artut truat rtuat turat utrat rutat urtat taurt aturt tuart utart autrt uatrt rautt arutt ruatt uratt aurtt uartt trtua rttua ttrua ttrua rttua trtua truta rtuta turta utrta rutta urtta ttura ttura tutra uttra tutra uttra rtuta truta rutta urtta turta utrta tatur attur ttaur ttaur attur tatur tautr atutr tuatr utatr auttr uattr ttuar ttuar tutar uttar tutar uttar atutr tautr auttr uattr tuatr utatr ratut artut rtaut traut atrut tarut rautt arutt ruatt uratt aurtt uartt rtuat truat rutat urtat turat utrat aturt taurt autrt uatrt tuart utart
Note: these 'words' (valid or invalid) are all the permutations of the word tratu. These words are obtained by scrambling the letters in tratu.