vacua avcua vcaua cvaua acvua cavua vauca avuca vuaca uvaca auvca uavca vcuaa cvuaa vucaa uvcaa cuvaa ucvaa acuva cauva aucva uacva cuava ucava vacau avcau vcaau cvaau acvau cavau vaacu avacu vaacu avacu aavcu aavcu vcaau cvaau vacau avcau cavau acvau acavu caavu aacvu aacvu caavu acavu vauac avuac vuaac uvaac auvac uavac vaauc avauc vaauc avauc aavuc aavuc vuaac uvaac vauac avuac uavac auvac auavc uaavc aauvc aauvc uaavc auavc vcuaa cvuaa vucaa uvcaa cuvaa ucvaa vcaua cvaua vacua avcua cavua acvua vuaca uvaca vauca avuca uavca auvca cuava ucava cauva acuva uacva aucva acuav cauav aucav uacav cuaav ucaav acauv caauv aacuv aacuv caauv acauv auacv uaacv aaucv aaucv uaacv auacv cuaav ucaav cauav acuav uacav aucav
Note: these 'words' (valid or invalid) are all the permutations of the word vacua. These words are obtained by scrambling the letters in vacua.