b-u bbb bbi bbl bbm bbs bbu bi- bib bii bil bim bis biu blb bli bll blm bls blu bmb bmi bml bmm bms bmu bsb bsi bsl bsm bss bsu bub bui bul bum bus buu ibb ibi ibl ibm ibs ibu iib iii iil iim iis iiu il- ilb ili ill ilm ils ilu im- imb imi iml imm ims imu is- isb isi isl ism iss isu iu- iub iui ium ius lbb lbi lbl lbm lbs lbu lib lii lil lim lis liu llb lli lll llm lls llu lmb lmi lml lmm lms lmu lsb lsi lsl lsm lss lsu lub lui lul lum lus luu mbb mbi mbl mbm mbs mbu mi- mib mii mil mim mis miu mlb mli mll mlm mls mlu mmb mmi mml mmm mms mmu msb msi msl msm mss msu mub mui mul mum mus muu sbb sbi sbl sbm sbs sbu sib sii sil sim sis siu slb sli sll slm sls slu smb smi sml smm sms smu ss- ssb ssi ssl ssm sss ssu sub sui sul sum sus suu ubb ubi ubl ubs ubu uib uii uil uim uis uiu ulb uli ull ulm uls ulu um- umb umi uml umm ums umu usb usi usl usm uss usu uum uus uuu