-er b-u bbb bbe bbm bbr bbt bbu be- beb bee bem ber bet beu bez bmb bme bmm bmr bmt bmu bmz brb bre brm brr brt bru brz btb bte btm btr btt btu btz bub bue bum bur but buu buz bze bzr bzu bzz ebb ebe ebm ebr ebt ebu eeb eee eem eer eet em- emb eme emm emr emt emu erb ere erm err ert eru erz etb ete etm etr ett etu etz eu- eub eue eur eut eze ezr ezz m-r mbb mbe mbm mbr mbt mbu meb mee mem mer met meu mez mmb mme mmm mmr mmt mmu mmz mrb mre mrm mrr mrt mru mrz mtb mte mtm mtr mtt mtu mub mue mum mur mut muu mzb mzm mzt rbb rbe rbm rbr rbt rbu re- reb ree rem rer ret reu rez rmb rme rmm rmr rmt rrb rrm rrr rrt rru rtb rte rtm rtr rtt rtu rtz rub rue rum rur rut ruu ruz rzb rze rzm tbb tbe tbm tbr tbt tbu tbz te- teb tee tem ter tet teu tez tmb tme tmm tmr tmt tmu tmz trb tre trm trr trt tru trz ttb tte ttm ttr ttt ttu tub tue tum tur tut tuu tuz tze tzu ubb ube ubr ubt ubu ueb uee uem uer uet um- umb ume umm umr umt umu ur- urb ure urm urr urt uru urz utb ute utm utr utt utu utz uue uum uur uut uuu uzb uzu zbb zbm zbr zbt zeb zee zem zer zet zez zmb zmm zmt zte ztm ztr zub zum zur zut zuz zzr zzt zzz