dddd ddss ddts dfds dfdt dfrf dftr dfts dntt dnus dnut drrs drus drut druu dsdr dsrr dssn dsst dstn dsts dtss dudd duds dudu duff dufu dunn duns dunt durn durt duru dust duts duur duut fdst ffff ffrr ffss fftf ffun fndd fndn fndr fnrs fnuf frns frst frun fssf ftrs ftsr fudd fuff fufu fund funf funs funt fur- furn furr furs furt fusd fuss fust fusu futs futu ndnt ndrf ndsf ndss ndut nfff nfrs nfsr nfsu nnnn nnss nntn nrds nrrd nrts nsdf nsds nsdt nsfs nsnr nsrd nssf nssr nsss nstd nsts nstu ntds ntfs ntnd ntnu ntru ntsf ntss ntsu nttr nudd nuff nunn nuns nunt nurd nurn nurr nurs nurt nuru nuss nust nusu nuts nutt nutu rfds rndf rnds rnnt rntd rnut rrrr rrun rsdd rsds rsnn rsnr rsts rstu rtdt rtnd rtns rtss rtts rudd ruds ruff ruft rund runf runn runs runt rurd rurs ruru russ rust rusu ruts rutt rutu ruud ruun sdds sdrs sdsf sdss sdsu sfnt sfss sfsu sfts snfu snns snrs snsd sntr snur snus srnn srsd srtr ssdd ssdf ssns ssrs sssf ssss sstd ssts stds stfn stfu stnd stnn stnr stns strd strn strs stru stsf stss sttd sttr stud stuf stun stur stus stut sudd suds suf- suff sufr sufs sufu sun- sund sunn suns sunt sunu sur- surd surf surn surr surs surt suru sus- susd suss sust susu sutu suus tdff tdss tfrs tfsd tfss tndd tndf tnts tnut trfd trfr trsd trst trtr trud trun trus trut truu tssf tssr tsst tsts tsun ttff ttfn ttss tttt tudu tuff tuft tufu tund tunn tuns tunu turd turf turn turr turs turt turu tusd tuss tust tuts tutt tutu udds udsd udts udun unds unfd unns unrf unrs uns- unst unts unus unut urds urdu urff urft urns urss ursu urts urun urur urus urut usdf usds usdt usfs usnr usnu ussf ussr usss usst ussu usts usun usus uttu uutf uuuu