bbb bbe bbl bbm bbs be- beb bee bel bem bes blb ble bll blm bls bmb bme bml bmm bms bsb bse bsl bsm bss ebb ebe ebl ebm ebs eeb eee eel eem ees elb ele ell elm els em- emb eme eml emm ems es- esb ese esl esm ess lbb lbe lbl lbm lbs leb lee lel lem les llb lle lll llm lls lmb lme lml lmm lms lsb lse lsl lsm lss mbb mbe mbl mbm mbs meb mee mel mem mes mlb mle mll mlm mls mmb mme mml mmm mms msb mse msl msm mss sbb sbe sbl sbm sbs se- seb see sel sem ses slb sle sll slm sls smb sme sml smm sms ss- ssb sse ssl ssm sss