bbbb bbbs bbhs bhhs bhrt bhur bhut bhuu brhs brrr brrs brsb brsr brst bruh brus brut bshs bsts bths btrt btss bttb btus bubb bubs bubu buhr buhs bur- burb burh burr burs burt buru bush buss bust busu but- buts butt buus hbbs hbhs hbrs hbss hbtu hhhh hhhs hhus hrhs hrtb hshs hsts hsur hths httr hubb hubs huhs huhu hurr hurs hurt huru hush huss hust huth huts hutt hutu huub huus rbbb rbbr rbbs rbhs rbss rbst rhhs rhus rrhs rrrr rshs rsts rstu rths rtss rtts rubb rubs rubu ruhh ruhr ruhs rurs ruru rush russ rust rusu ruth ruts rutt rutu sbbs sbhs sbst sbus shbs shbt shhh shhs shrs shts shub shur shus shut shuu srhs srtr srub ssbr sshs ssrs sssb sssh ssss sstb ssth ssts stbs sths strs stru stss sttr stub stur stus stut sub- subb subh subs suhb suhr sur- surr surs surt suru sus- suss sust susu sutu suus tbbs tbhs tbrb tbst thbs thru thsr thss thtb thtr thts thur thus trhs trst trtr trub trus trut truu tshb tshs tssr tsst tsts ttbb ttss tttt tubb tubr tubs tubu tuhs tuht tuhu turb turr turs turt turu tush tuss tust tuts tutt tutu uhrs uhss uhuh urbs urrh urss ursu urth urts urur urus urut usbr usbs ushr ushs ushu ussb ussr usss usst ussu ustb usts usus uttu uuuu