thunk htunk tuhnk uthnk hutnk uhtnk thnuk htnuk tnhuk nthuk hntuk nhtuk tunhk utnhk tnuhk ntuhk unthk nuthk huntk uhntk hnutk nhutk unhtk nuhtk thukn htukn tuhkn uthkn hutkn uhtkn thkun htkun tkhun kthun hktun khtun tukhn utkhn tkuhn ktuhn ukthn kuthn huktn uhktn hkutn khutn ukhtn kuhtn thnku htnku tnhku nthku hntku nhtku thknu htknu tkhnu kthnu hktnu khtnu tnkhu ntkhu tknhu ktnhu nkthu knthu hnktu nhktu hkntu khntu nkhtu knhtu tunkh utnkh tnukh ntukh untkh nutkh tuknh utknh tkunh ktunh uktnh kutnh tnkuh ntkuh tknuh ktnuh nktuh kntuh unkth nukth uknth kunth nkuth knuth hunkt uhnkt hnukt nhukt unhkt nuhkt huknt uhknt hkunt khunt ukhnt kuhnt hnkut nhkut hknut khnut nkhut knhut unkht nukht uknht kunht nkuht knuht
Note: these 'words' (valid or invalid) are all the permutations of the word thunk. These words are obtained by scrambling the letters in thunk.