-er bbb bbe bbl bbm bbr bbs bbt be- beb bee bel bem ber bes bet blb ble bll blm blr bls blt bmb bme bml bmm bmr bms bmt brb bre brl brm brr brs brt bsb bse bsl bsm bsr bss bst btb bte btl btm btr bts btt ebb ebe ebl ebm ebr ebs ebt eeb eee eel eem eer ees eet elb ele ell elm elr els elt em- emb eme eml emm emr ems emt erb ere erl erm err ers ert es- esb ese esl esm esr ess est etb ete etl etm etr ets ett lbb lbe lbl lbm lbr lbs lbt leb lee lel lem ler les let llb lle lll llm llr lls llt lmb lme lml lmm lmr lms lmt lrb lrm lrr lrs lrt lsb lse lsl lsm lsr lss lst ltb lte ltl ltm ltr lts ltt m-r mbb mbe mbl mbm mbr mbs mbt meb mee mel mem mer mes met mlb mle mll mlm mlr mls mlt mmb mme mml mmm mmr mms mmt mrb mre mrl mrm mrr mrs mrt msb mse msl msm msr mss mst mtb mte mtl mtm mtr mts mtt rbb rbe rbl rbm rbr rbs rbt re- reb ree rel rem rer res ret rle rll rlm rlr rls rlt rmb rme rml rmm rmr rms rmt rrb rrl rrm rrr rrs rrt rsb rse rsl rsm rsr rss rst rtb rte rtl rtm rtr rts rtt sbb sbe sbl sbm sbr sbs sbt se- seb see sel sem ser ses set slb sle sll slm slr sls slt smb sme sml smm smr sms smt sr- srb sre srl srm srr srs srt ss- ssb sse ssl ssm ssr sss sst stb ste stl stm str sts stt tbb tbe tbl tbm tbr tbs tbt te- teb tee tel tem ter tes tet tle tll tlm tlr tls tlt tmb tme tml tmm tmr tms tmt trb tre trl trm trr trs trt tsb tse tsl tsm tsr tss tst ttb tte ttl ttm ttr tts ttt