dungs udngs dnugs ndugs undgs nudgs dugns udgns dguns gduns ugdns gudns dngus ndgus dgnus gdnus ngdus gndus ungds nugds ugnds gunds nguds gnuds dunsg udnsg dnusg ndusg undsg nudsg dusng udsng dsung sdung usdng sudng dnsug ndsug dsnug sdnug nsdug sndug unsdg nusdg usndg sundg nsudg snudg dugsn udgsn dgusn gdusn ugdsn gudsn dusgn udsgn dsugn sdugn usdgn sudgn dgsun gdsun dsgun sdgun gsdun sgdun ugsdn gusdn usgdn sugdn gsudn sgudn dngsu ndgsu dgnsu gdnsu ngdsu gndsu dnsgu ndsgu dsngu sdngu nsdgu sndgu dgsnu gdsnu dsgnu sdgnu gsdnu sgdnu ngsdu gnsdu nsgdu sngdu gsndu sgndu ungsd nugsd ugnsd gunsd ngusd gnusd unsgd nusgd usngd sungd nsugd snugd ugsnd gusnd usgnd sugnd gsund sgund ngsud gnsud nsgud sngud gsnud sgnud
Note: these 'words' (valid or invalid) are all the permutations of the word dungs. These words are obtained by scrambling the letters in dungs.