bbb bbi bbl bbm bbs bbt bi- bib bii bil bim bis bit blb bli bll blm bls blt bmb bmi bml bmm bms bmt bsb bsi bsl bsm bss bst btb bti btl btm bts btt ibb ibi ibl ibm ibs ibt iib iii iil iim iis iit il- ilb ili ill ilm ils ilt im- imb imi iml imm ims imt is- isb isi isl ism iss ist itb iti itl itm its itt lbb lbi lbl lbm lbs lbt lib lii lil lim lis lit llb lli lll llm lls llt lmb lmi lml lmm lms lmt lsb lsi lsl lsm lss lst ltb lti ltl ltm lts ltt mbb mbi mbl mbm mbs mbt mi- mib mii mil mim mis mit mlb mli mll mlm mls mlt mmb mmi mml mmm mms mmt msb msi msl msm mss mst mtb mti mtl mtm mts mtt sbb sbi sbl sbm sbs sbt sib sii sil sim sis sit slb sli sll slm sls slt smb smi sml smm sms smt ss- ssb ssi ssl ssm sss sst stb sti stl stm sts stt tbb tbi tbl tbm tbs tbt tib tii til tim tis tit tli tll tlm tls tlt tmb tmi tml tmm tms tmt tsb tsi tsl tsm tss tst ttb tti ttl ttm tts ttt