ffff ffrr ffss fftf flts fluf flur flus frst fssf ft-l ftrs ftsr fuff fufu full fuls fulu fur- furl furr furs furt fuss fust fusu futs futu lfts llll lrrr lrst lrts ls-r lssr lsts ltrs ltsr lttr luff luft lufu lull lulu lurs lurt luss lust luts rffl rlls rrrr rssl rsts rstu rtls rtlt rtss rtts ruff ruft rull rurs ruru russ rust rusu rutl ruts rutt rutu sfls sfss sfsu sfts slft slrs slst slsu slts slur slut srtr ssfl sslt ssrl ssrs sssf ssss sstl ssts stfu stlt strs stru stsf stss sttr stuf stul stur stus stut suf- suff sufr sufs sufu sul- sulf sull sult sulu sur- surf surr surs surt suru sus- suss sust susu sutu suus tfrs tfss tlrs trfr trst trtr trus trut truu tsfl tssf tssr tsst tsts ttff ttss tttt ttul tuff tuft tufu tull tulu turf turr turs turt turu tuss tust tutl tuts tutt tutu ulft ullr ults ultt ulul ulus urff urft urls urss ursu urts urur urus urut usfl usfs uslu ussf ussr usss usst ussu usts usul usus utsl uttu uulu uutf uuuu