bbbb bbbs bblb bbls blbt blls blss blst blts blub blur blus blut bly- blys brls brrr brrs brsb brsr brst brus brut bry- bsts btrt btry btss bttb btus bubb bubs bubu bulb bull buls bult bulu bur- burb burl burr burs burt buru bury buss bust busu busy but- buts butt buty buus buyl buys buyu bylt byrt bysb bysl byss byst bysy byts byul lblr lbrs lbrt llbs llll llyr lrrr lrry lrst lrts ls-r lsbu lssr lsts ltbl ltrs ltsr lttr ltyr lubs luby lull lulu lurs lurt lury luss lust luts luys luyt lyly lys- lysl lyss lyst lytt rbbb rbbr rbbs rbsl rbss rbst rlls rlys rrrr rssl rsts rstu rtls rtlt rtss rtts rubb rubs rubu ruby rull ruly rurs ruru russ rust rusu rusy rutl ruts rutt rutu ruty ruyl ruys rysy rytt ryyt sbbs sbst sbus slrs slst slsu slts slub slur slut slys srby srtr srub ssbr ssby sslt ssrl ssrs sssb ssss sstb sstl ssts stbs stlt strs stru stry stss sttr stub stul stur stus stut stuy styl styr stys sub- subb subl subs sul- sull sult sulu sur- surr surs surt suru sury sus- suss sust susu susy sutu suty suus suyr suyu syl- syll syls sylt syrs syrt syry syss syst sytt tbbs tbrb tbst tlrs trst trtr trub trus trut truu try- tryb trys tssr tsst tsts tsys ttbb ttss tttt ttul ttyl ttys tubb tubr tubs tubu tull tulu tuly turb turr turs turt turu tury tuss tust tutl tuts tutt tutu tuty tuyl tuys tyl- tyll tyr- tyrl tyrr tyss tyst tytt tyty tyus ubls ubly ullr ully ults ultt ulul ulus ulys urbs urls urry urss ursu ursy urts urur urus urut usbl usbr usbs uslu ussb ussr usss usst ussu ussy ustb usts usul usus utby utsl uttu uulu uuuu uyts ybbs ybry ylls yrly ysby yssu ysyb yubu yuls yulu yurt yury yust yutu yuty yuyu yyyy