b-u bbb bbi bbm bbs bbt bbu bi- bib bii bim bis bit biu bmb bmi bmm bms bmt bmu bsb bsi bsm bss bst bsu btb bti btm bts btt btu bub bui bum bus but buu ibb ibi ibm ibs ibt ibu iib iii iim iis iit iiu im- imb imi imm ims imt imu is- isb isi ism iss ist isu itb iti itm its itt itu iu- iub iui ium ius iut mbb mbi mbm mbs mbt mbu mi- mib mii mim mis mit miu mmb mmi mmm mms mmt mmu msb msi msm mss mst msu mtb mti mtm mts mtt mtu mub mui mum mus mut muu sbb sbi sbm sbs sbt sbu sib sii sim sis sit siu smb smi smm sms smt smu ss- ssb ssi ssm sss sst ssu stb sti stm sts stt stu sub sui sum sus sut suu tbb tbi tbm tbs tbt tbu tib tii tim tis tit tiu tmb tmi tmm tms tmt tmu tsb tsi tsm tss tst tsu ttb tti ttm tts ttt ttu tub tui tum tus tut tuu ubb ubi ubs ubt ubu uib uii uim uis uit uiu um- umb umi umm ums umt umu usb usi usm uss ust usu utb uti utm uts utt utu uum uus uut uuu