bbbb bbbs bmts bmus bnss bntm bsms bsmt bsns bssm bsts btss bttb btus bubb bubs bubu bum- bumb bums bunb bunn buns bunt bunu buss bust busu but- buts butt buus mbbs mbms mbus mmmm mmms mmst mmsu mmts mmun mmus mnbb mntb mntn msmb msmm msms msmu mssm msst msts msun msus mtbs mtns mtnt mtss mtst mtts mubs mumm mums mumu munn muns munt munu muss must musu muts mutt mutu muut nmnt nmtb nnmt nnnn nnss nntn nsbm nsmb nssb nsss nsts nstu nsub ntnu ntsb ntss ntsu nttm nubs numb numm nums numt numu nunn nuns nunt nuss nust nusu nuts nutt nutu sbbs sbst sbtn sbus smsn smss smtn smtu smus smut snns snub snum snus ssbn ssns sssb sssm ssss sstb ssts stbs stms stmt stnn stns stsm stss stub stum stun stus stut sub- subb subm subs sum- sums sumu sun- sunb sunn suns sunt sunu sus- suss sust susu sutu suum suus tbbs tbst tmnt tmtt tnts tnut tssm tsst tstm tsts tsum tsun ttbb ttms ttss tttt tubb tubs tubu tumb tums tumu tunb tunn tuns tunu tusm tuss tust tuts tutt tutu tuum umb- umms umsu umts umus umut unns uns- unst untb unts unum unus unut usbs usmm usms usnu ussb usss usst ussu ustb ustm usts usun usus utmb uttu uuuu