bbb bbe bbl bbm bbn be- beb bee bel bem ben blb ble bll blm bln bmb bme bml bmm bmn bnb bne bnl bnn ebb ebe ebl ebm ebn eeb eee eel eem een elb ele ell elm eln em- emb eme eml emm emn en- enb ene enl enm enn lbb lbe lbl lbm leb lee lel lem len llb lle lll llm lln lmb lme lml lmm lmn lnb lne lnl lnm lnn mbb mbe mbl mbm meb mee mel mem men mlb mle mll mlm mln mmb mme mml mmm mmn mnb mne mnl mnm mnn nbb nbe nbl nbm nbn ne- neb nee nel nem nen nlb nle nll nlm nln nmb nme nml nmm nmn nnb nne nnl nnm nnn