prued rpued pured upred ruped urped preud rpeud perud eprud repud erpud puerd uperd peurd epurd ueprd euprd ruepd urepd reupd erupd uerpd eurpd prude rpude purde uprde rupde urpde prdue rpdue pdrue dprue rdpue drpue pudre updre pdure dpure udpre dupre rudpe urdpe rdupe drupe udrpe durpe predu rpedu perdu eprdu repdu erpdu prdeu rpdeu pdreu dpreu rdpeu drpeu pedru epdru pderu dperu edpru depru redpu erdpu rdepu drepu edrpu derpu puedr upedr peudr epudr uepdr eupdr puder upder pduer dpuer udper duper pedur epdur pdeur dpeur edpur depur uedpr eudpr udepr duepr edupr deupr ruedp uredp reudp erudp uerdp eurdp rudep urdep rduep druep udrep durep redup erdup rdeup dreup edrup derup uedrp eudrp uderp duerp edurp deurp
Note: these 'words' (valid or invalid) are all the permutations of the word prued. These words are obtained by scrambling the letters in prued.