dirth idrth drith rdith irdth ridth ditrh idtrh dtirh tdirh itdrh tidrh drtih rdtih dtrih tdrih rtdih trdih irtdh ritdh itrdh tirdh rtidh tridh dirht idrht driht rdiht irdht ridht dihrt idhrt dhirt hdirt ihdrt hidrt drhit rdhit dhrit hdrit rhdit hrdit irhdt rihdt ihrdt hirdt rhidt hridt dithr idthr dtihr tdihr itdhr tidhr dihtr idhtr dhitr hditr ihdtr hidtr dthir tdhir dhtir hdtir thdir htdir ithdr tihdr ihtdr hitdr thidr htidr drthi rdthi dtrhi tdrhi rtdhi trdhi drhti rdhti dhrti hdrti rhdti hrdti dthri tdhri dhtri hdtri thdri htdri rthdi trhdi rhtdi hrtdi thrdi htrdi irthd rithd itrhd tirhd rtihd trihd irhtd rihtd ihrtd hirtd rhitd hritd ithrd tihrd ihtrd hitrd third htird rthid trhid rhtid hrtid thrid htrid
Note: these 'words' (valid or invalid) are all the permutations of the word dirth. These words are obtained by scrambling the letters in dirth.