bbbb bbbs bbhs bhhs bhut bhuu bnhs bnss bshs bsns bsts bths btss bttb btus bubb bubs bubu buhs bunb bunn buns bunt bunu bush buss bust busu but- buts butt buus hbbs hbhs hbss hbtu hhhh hhhs hhus hnhs hntb hnts hshs hstn hsts hths hubb hubs huhn huhs huhu hunh huns hunt hush huss hust huth huts hutt hutu huub huus nbhs nhhs nhnn nhst nnhs nnnn nnss nntn nshs nssb nsss nsts nstu nsub nthn nths ntht ntnu ntsb ntss ntsu nubs nunn nuns nunt nush nuss nust nusu nuth nuts nutt nutu sbbs sbhs sbst sbtn sbus shbs shbt shhh shhs shts shub shun shus shut shuu snhs snns snub snus ssbn sshs ssns sssb sssh ssss sstb ssth ssts stbs sthn sths stnn stns stss stub stun stus stut sub- subb subh subs suhb sun- sunb sunn suns sunt sunu sus- suss sust susu sutu suus tbbs tbhs tbst thbs thnt thss thtb thts thun thus tnsh tnts tnut tshb tshs tsst tsts tsun ttbb ttss tttt tubb tubs tubu tuhs tuht tuhu tunb tunn tuns tunu tush tuss tust tuts tutt tutu uhss uhuh unns uns- unst untb unth unts unus unut usbs ushs ushu usnu ussb usss usst ussu ustb usts usun usus uttu uuuu