bbbb bbbs bmus bpms bpsu bsms bspp bssm bsup bubb bubs bubu bum- bumb bump bums bups buss busu buus mbbs mbms mbps mbus mmmm mmms mmpu mmsu mmus mppp mpps msmb msmm msms msmu mspb mspp mssm mssp msus mubs mumm mump mums mumu mups muss musu pbsp pmmp pmmu pmpm ppms pppp ppps ppss pspp psps pssm pubs pubu pump pups pupu puss sbbs sbsp sbus smps smsp smss smus spms spps spsp spss spus ssps sssb sssm ssss sub- subb subm subs sum- sump sums sumu sup- supp sups sus- susp suss susu suum suus umb- umms umps umsp umsu umus uppp uppu upup usbs usmm usmp usms uspp usps ussb usss ussu usus uuuu