ctern tcern cetrn ectrn tecrn etcrn ctren tcren crten rcten trcen rtcen certn ecrtn cretn rcetn erctn rectn tercn etrcn trecn rtecn ertcn retcn ctenr tcenr cetnr ectnr tecnr etcnr ctner tcner cnter ncter tncer ntcer centr ecntr cnetr ncetr enctr nectr tencr etncr tnecr ntecr entcr netcr ctrne tcrne crtne rctne trcne rtcne ctnre tcnre cntre nctre tncre ntcre crnte rcnte cnrte ncrte rncte nrcte trnce rtnce tnrce ntrce rntce nrtce cernt ecrnt crent rcent ercnt recnt cenrt ecnrt cnert ncert encrt necrt crnet rcnet cnret ncret rncet nrcet ernct renct enrct nerct rnect nrect ternc etrnc trenc rtenc ertnc retnc tenrc etnrc tnerc nterc entrc netrc trnec rtnec tnrec ntrec rntec nrtec erntc rentc enrtc nertc rnetc nretc
Note: these 'words' (valid or invalid) are all the permutations of the word ctern. These words are obtained by scrambling the letters in ctern.