-er bbb bbe bbk bbl bbm bbr be- beb bee bek bel bem ber bkb bke bkk bkl bkm bkr blb ble blk bll blm blr bmb bme bmk bml bmm bmr brb bre brk brl brm brr ebb ebe ebk ebl ebm ebr eeb eee eek eel eem eer ekb eke ekl ekr elb ele elk ell elm elr em- emb eme emk eml emm emr erb ere erk erl erm err kbb kbe kbk kbl kbm kbr ke- keb kee kek kel kem ker kkb kke kkk kkl kkm kkr kl- klb klm klr kmb kme kmk kml kmm krk krl krr lbb lbe lbk lbl lbm lbr leb lee lek lel lem ler lkb lkl lkr llb lle llk lll llm llr lmb lme lmk lml lmm lmr lrb lrk lrm lrr m-r mbb mbe mbk mbl mbm mbr meb mee mek mel mem mer mkb mke mkk mkl mkm mkr mlb mle mlk mll mlm mlr mmb mme mmk mml mmm mmr mrb mre mrk mrl mrm mrr rbb rbe rbk rbl rbm rbr re- reb ree rek rel rem rer rkb rke rkk rkm rle rll rlm rlr rmb rme rml rmm rmr rrb rrk rrl rrm rrr