ubtao butao utbao tubao btuao tbuao ubato buato uabto aubto bauto abuto utabo tuabo uatbo autbo taubo atubo btauo tbauo batuo abtuo tabuo atbuo ubtoa butoa utboa tuboa btuoa tbuoa ubota buota uobta oubta bouta obuta utoba tuoba uotba outba touba otuba btoua tboua botua obtua tobua otbua ubaot buaot uabot aubot bauot abuot uboat buoat uobat oubat bouat obuat uaobt auobt uoabt ouabt aoubt oaubt baout about boaut obaut aobut oabut utaob tuaob uatob autob tauob atuob utoab tuoab uotab outab touab otuab uaotb auotb uoatb ouatb aoutb oautb taoub atoub toaub otaub aotub oatub btaou tbaou batou abtou tabou atbou btoau tboau botau obtau tobau otbau baotu abotu boatu obatu aobtu oabtu taobu atobu toabu otabu aotbu oatbu
Note: these 'words' (valid or invalid) are all the permutations of the word ubtao. These words are obtained by scrambling the letters in ubtao.