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