teach etach taech atech eatch aetch tecah etcah tceah cteah ectah cetah taceh atceh tcaeh ctaeh acteh cateh eacth aecth ecath ceath aceth caeth teahc etahc taehc atehc eathc aethc tehac ethac theac hteac ehtac hetac tahec athec thaec htaec ahtec hatec eahtc aehtc ehatc heatc ahetc haetc techa etcha tceha cteha ectha cetha tehca ethca theca hteca ehtca hetca tchea cthea thcea htcea chtea hctea echta cehta ehcta hecta cheta hceta tache atche tcahe ctahe acthe cathe tahce athce thace htace ahtce hatce tchae cthae thcae htcae chtae hctae achte cahte ahcte hacte chate hcate eacht aecht ecaht ceaht aceht caeht eahct aehct ehact heact ahect haect echat cehat ehcat hecat cheat hceat achet cahet ahcet hacet chaet hcaet
Note: these 'words' (valid or invalid) are all the permutations of the word teach. These words are obtained by scrambling the letters in teach.