-er -ol bbb bbe bbl bbm bbo bbr bbt be- beb bee bel bem beo ber bet blb ble bll blm blo blr blt bmb bme bml bmm bmo bmr bmt bob boe bol bom boo bor bot brb bre brl brm bro brr brt btb bte btl btm bto btr btt ebb ebe ebl ebm ebo ebr ebt eeb eee eel eem eeo eer eet elb ele ell elm elo elr elt em- emb eme eml emm emo emr emt eo- eob eoe eol eom eoo eor eot erb ere erl erm ero err ert etb ete etl etm eto etr ett lbb lbe lbl lbm lbo lbr lbt leb lee lel lem leo ler let llb lle lll llm llo llr llt lmb lme lml lmm lmo lmr lmt lob loe lol lom loo lor lot lrb lrm lro lrr lrt ltb lte ltl ltm lto ltr ltt m-o m-r mbb mbe mbl mbm mbo mbr mbt meb mee mel mem meo mer met mlb mle mll mlm mlo mlr mlt mmb mme mml mmm mmo mmr mmt mob moe mol mom moo mor mot mrb mre mrl mrm mro mrr mrt mtb mte mtl mtm mto mtr mtt ob- obb obe obl obm obo obr obt oeb oee oel oem oeo oer oet olb ole oll olm olo olt om- omb ome oml omm omo omr omt oo- oob ool oom ooo oor oot or- orb ore orl orm oro orr ort ot- otb ote otl otm oto otr ott rbb rbe rbl rbm rbo rbr rbt re- reb ree rel rem reo rer ret rle rll rlm rlo rlr rlt rmb rme rml rmm rmo rmr rmt rob roe rol rom roo ror rot rrb rrl rrm rrr rrt rtb rte rtl rtm rto rtr rtt tbb tbe tbl tbm tbo tbr tbt te- teb tee tel tem teo ter tet tle tll tlm tlo tlr tlt tmb tme tml tmm tmo tmr tmt to- tob toe tol tom too tor tot trb tre trl trm tro trr trt ttb tte ttl ttm tto ttr ttt