trail rtail taril atril ratil artil trial rtial tiral itral rital irtal tairl atirl tiarl itarl aitrl iatrl raitl aritl riatl iratl airtl iartl trali rtali tarli atrli ratli artli trlai rtlai tlrai ltrai rltai lrtai talri atlri tlari ltari altri latri ralti arlti rlati lrati alrti larti trila rtila tirla itrla ritla irtla trlia rtlia tlria ltria rltia lrtia tilra itlra tlira ltira iltra litra rilta irlta rlita lrita ilrta lirta tailr atilr tialr italr aitlr iatlr talir atlir tlair ltair altir latir tilar itlar tliar ltiar iltar litar ailtr ialtr alitr laitr ilatr liatr railt arilt rialt iralt airlt iarlt ralit arlit rlait lrait alrit larit rilat irlat rliat lriat ilrat lirat ailrt ialrt alirt lairt ilart liart
Note: these 'words' (valid or invalid) are all the permutations of the word trail. These words are obtained by scrambling the letters in trail.