tvacu vtacu tavcu atvcu vatcu avtcu tvcau vtcau tcvau ctvau vctau cvtau tacvu atcvu tcavu ctavu actvu catvu vactu avctu vcatu cvatu acvtu cavtu tvauc vtauc tavuc atvuc vatuc avtuc tvuac vtuac tuvac utvac vutac uvtac tauvc atuvc tuavc utavc autvc uatvc vautc avutc vuatc uvatc auvtc uavtc tvcua vtcua tcvua ctvua vctua cvtua tvuca vtuca tuvca utvca vutca uvtca tcuva ctuva tucva utcva cutva uctva vcuta cvuta vucta uvcta cuvta ucvta tacuv atcuv tcauv ctauv actuv catuv taucv atucv tuacv utacv autcv uatcv tcuav ctuav tucav utcav cutav uctav acutv cautv auctv uactv cuatv ucatv vacut avcut vcaut cvaut acvut cavut vauct avuct vuact uvact auvct uavct vcuat cvuat vucat uvcat cuvat ucvat acuvt cauvt aucvt uacvt cuavt ucavt
Note: these 'words' (valid or invalid) are all the permutations of the word tvacu. These words are obtained by scrambling the letters in tvacu.