skull ksull sukll uskll kusll uksll sklul kslul slkul lskul klsul lksul sulkl uslkl slukl lsukl ulskl luskl kulsl uklsl klusl lkusl ulksl luksl skull ksull sukll uskll kusll uksll sklul kslul slkul lskul klsul lksul sulkl uslkl slukl lsukl ulskl luskl kulsl uklsl klusl lkusl ulksl luksl skllu ksllu slklu lsklu klslu lkslu skllu ksllu slklu lsklu klslu lkslu sllku lslku sllku lslku llsku llsku kllsu lklsu kllsu lklsu llksu llksu sullk usllk slulk lsulk ulslk luslk sullk usllk slulk lsulk ulslk luslk slluk lsluk slluk lsluk llsuk llsuk ullsk lulsk ullsk lulsk llusk llusk kulls uklls kluls lkuls ulkls lukls kulls uklls kluls lkuls ulkls lukls kllus lklus kllus lklus llkus llkus ullks lulks ullks lulks lluks lluks
Note: these 'words' (valid or invalid) are all the permutations of the word skull. These words are obtained by scrambling the letters in skull.