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