b-u bbb bbi bbl bbm bbs bbt bbu bi- bib bii bil bim bis bit biu blb bli bll blm bls blt blu bmb bmi bml bmm bms bmt bmu bsb bsi bsl bsm bss bst bsu btb bti btl btm bts btt btu bub bui bul bum bus but buu ibb ibi ibl ibm ibs ibt ibu iib iii iil iim iis iit iiu il- ilb ili ill ilm ils ilt ilu im- imb imi iml imm ims imt imu is- isb isi isl ism iss ist isu itb iti itl itm its itt itu iu- iub iui ium ius iut lbb lbi lbl lbm lbs lbt lbu lib lii lil lim lis lit liu llb lli lll llm lls llt llu lmb lmi lml lmm lms lmt lmu lsb lsi lsl lsm lss lst lsu ltb lti ltl ltm lts ltt ltu lub lui lul lum lus lut luu mbb mbi mbl mbm mbs mbt mbu mi- mib mii mil mim mis mit miu mlb mli mll mlm mls mlt mlu mmb mmi mml mmm mms mmt mmu msb msi msl msm mss mst msu mtb mti mtl mtm mts mtt mtu mub mui mul mum mus mut muu sbb sbi sbl sbm sbs sbt sbu sib sii sil sim sis sit siu slb sli sll slm sls slt slu smb smi sml smm sms smt smu ss- ssb ssi ssl ssm sss sst ssu stb sti stl stm sts stt stu sub sui sul sum sus sut suu tbb tbi tbl tbm tbs tbt tbu tib tii til tim tis tit tiu tli tll tlm tls tlt tlu tmb tmi tml tmm tms tmt tmu tsb tsi tsl tsm tss tst tsu ttb tti ttl ttm tts ttt ttu tub tui tul tum tus tut tuu ubb ubi ubl ubs ubt ubu uib uii uil uim uis uit uiu ulb uli ull ulm uls ult ulu um- umb umi uml umm ums umt umu usb usi usl usm uss ust usu utb uti utl utm uts utt utu uum uus uut uuu