ctmun tcmun cmtun mctun tmcun mtcun ctumn tcumn cutmn uctmn tucmn utcmn cmutn mcutn cumtn ucmtn muctn umctn tmucn mtucn tumcn utmcn mutcn umtcn ctmnu tcmnu cmtnu mctnu tmcnu mtcnu ctnmu tcnmu cntmu nctmu tncmu ntcmu cmntu mcntu cnmtu ncmtu mnctu nmctu tmncu mtncu tnmcu ntmcu mntcu nmtcu ctunm tcunm cutnm uctnm tucnm utcnm ctnum tcnum cntum nctum tncum ntcum cuntm ucntm cnutm ncutm unctm nuctm tuncm utncm tnucm ntucm untcm nutcm cmunt mcunt cumnt ucmnt mucnt umcnt cmnut mcnut cnmut ncmut mncut nmcut cunmt ucnmt cnumt ncumt uncmt nucmt munct umnct mnuct nmuct unmct numct tmunc mtunc tumnc utmnc mutnc umtnc tmnuc mtnuc tnmuc ntmuc mntuc nmtuc tunmc utnmc tnumc ntumc untmc nutmc muntc umntc mnutc nmutc unmtc numtc
Note: these 'words' (valid or invalid) are all the permutations of the word ctmun. These words are obtained by scrambling the letters in ctmun.