-er bbb bbe bbg bbl bbm bbr be- beb bee beg bel bem ber bgb bge bgg bgl bgm bgr blb ble blg bll blm blr bmb bme bmg bml bmm bmr brb bre brg brl brm brr ebb ebe ebg ebl ebm ebr eeb eee eeg eel eem eer egb ege egg egl egm egr elb ele elg ell elm elr em- emb eme emg eml emm emr erb ere erg erl erm err gbe gbg gbl gbm gbr ge- geb gee geg gel gem ger ggb ggg ggm ggr glb gle glg gll glm glr gmb gme gmg gml gmm gmr grb gre grg grl grm grr lbb lbe lbg lbl lbm lbr leb lee leg lel lem ler lgb lge lgg lgl lgm lgr llb lle llg lll llm llr lmb lme lmg lml lmm lmr lrb lrg lrm lrr m-r mbb mbe mbg mbl mbm mbr meb mee meg mel mem mer mgb mge mgl mgm mgr mlb mle mlg mll mlm mlr mmb mme mmg mml mmm mmr mrb mre mrg mrl mrm mrr rbb rbe rbg rbl rbm rbr re- reb ree reg rel rem rer rgb rge rgg rgr rle rlg rll rlm rlr rmb rme rmg rml rmm rmr rrb rrg rrl rrm rrr