frail rfail faril afril rafil arfil frial rfial firal ifral rifal irfal fairl afirl fiarl ifarl aifrl iafrl raifl arifl riafl irafl airfl iarfl frali rfali farli afrli rafli arfli frlai rflai flrai lfrai rlfai lrfai falri aflri flari lfari alfri lafri ralfi arlfi rlafi lrafi alrfi larfi frila rfila firla ifrla rifla irfla frlia rflia flria lfria rlfia lrfia filra iflra flira lfira ilfra lifra rilfa irlfa rlifa lrifa ilrfa lirfa failr afilr fialr ifalr aiflr iaflr falir aflir flair lfair alfir lafir filar iflar fliar lfiar ilfar lifar ailfr ialfr alifr laifr ilafr liafr railf arilf rialf iralf airlf iarlf ralif arlif rlaif lraif alrif larif rilaf irlaf rliaf lriaf ilraf liraf ailrf ialrf alirf lairf ilarf liarf
Note: these 'words' (valid or invalid) are all the permutations of the word frail. These words are obtained by scrambling the letters in frail.