bbb bbe bbk bbl bbm bbs be- beb bee bek bel bem bes bkb bke bkk bkl bkm bks blb ble blk bll blm bls bmb bme bmk bml bmm bms bsb bse bsk bsl bsm bss ebb ebe ebk ebl ebm ebs eeb eee eek eel eem ees ekb eke ekl eks elb ele elk ell elm els em- emb eme emk eml emm ems es- esb ese esk esl esm ess kbb kbe kbk kbl kbm kbs ke- keb kee kek kel kem kes kkb kke kkk kkl kkm kks kl- klb klm kls kmb kme kmk kml kmm kms ksb kse ksk ksl ksm kss lbb lbe lbk lbl lbm lbs leb lee lek lel lem les lkb lkl lks llb lle llk lll llm lls lmb lme lmk lml lmm lms lsb lse lsk lsl lsm lss mbb mbe mbk mbl mbm mbs meb mee mek mel mem mes mkb mke mkk mkl mkm mks mlb mle mlk mll mlm mls mmb mme mmk mml mmm mms msb mse msk msl msm mss sbb sbe sbk sbl sbm sbs se- seb see sek sel sem ses sk- skb ske skk skl skm sks slb sle slk sll slm sls smb sme smk sml smm sms ss- ssb sse ssk ssl ssm sss