-er bbb bbe bbl bbm bbr bbt be- beb bee bel bem ber bet blb ble bll blm blr blt bmb bme bml bmm bmr bmt brb bre brl brm brr brt btb bte btl btm btr btt ebb ebe ebl ebm ebr ebt eeb eee eel eem eer eet elb ele ell elm elr elt em- emb eme eml emm emr emt erb ere erl erm err ert etb ete etl etm etr ett lbb lbe lbl lbm lbr lbt leb lee lel lem ler let llb lle lll llm llr llt lmb lme lml lmm lmr lmt lrb lrm lrr lrt ltb lte ltl ltm ltr ltt m-r mbb mbe mbl mbm mbr mbt meb mee mel mem mer met mlb mle mll mlm mlr mlt mmb mme mml mmm mmr mmt mrb mre mrl mrm mrr mrt mtb mte mtl mtm mtr mtt rbb rbe rbl rbm rbr rbt re- reb ree rel rem rer ret rle rll rlm rlr rlt rmb rme rml rmm rmr rmt rrb rrl rrm rrr rrt rtb rte rtl rtm rtr rtt tbb tbe tbl tbm tbr tbt te- teb tee tel tem ter tet tle tll tlm tlr tlt tmb tme tml tmm tmr tmt trb tre trl trm trr trt ttb tte ttl ttm ttr ttt