bbb bbi bbl bbm bbs bi- bib bii bil bim bis blb bli bll blm bls bmb bmi bml bmm bms bsb bsi bsl bsm bss ibb ibi ibl ibm ibs iib iii iil iim iis il- ilb ili ill ilm ils im- imb imi iml imm ims is- isb isi isl ism iss lbb lbi lbl lbm lbs lib lii lil lim lis llb lli lll llm lls lmb lmi lml lmm lms lsb lsi lsl lsm lss mbb mbi mbl mbm mbs mi- mib mii mil mim mis mlb mli mll mlm mls mmb mmi mml mmm mms msb msi msl msm mss sbb sbi sbl sbm sbs sib sii sil sim sis slb sli sll slm sls smb smi sml smm sms ss- ssb ssi ssl ssm sss