-er b-u bbb bbe bbi bbl bbr bbt bbu be- beb bee bei bel ber bet beu bi- bib bie bii bil bir bit biu blb ble bli bll blr blt blu brb bre bri brl brr brt bru btb bte bti btl btr btt btu bub bue bui bul bur but buu ebb ebe ebi ebl ebr ebt ebu eeb eee eel eer eet eib eie eii eil eir eit eiu elb ele eli ell elr elt elu erb ere eri erl err ert eru etb ete eti etl etr ett etu eu- eub eue eui eul eur eut ibb ibe ibi ibl ibr ibt ibu ie- iee iei iel ier iet iib iie iii iil iir iit iiu il- ilb ile ili ill ilr ilt ilu ir- irb ire iri irl irr irt iru itb ite iti itl itt itu iu- iub iue iui iur iut lbb lbe lbi lbl lbr lbt lbu leb lee lei lel ler let leu lib lie lii lil lir lit liu llb lle lli lll llr llt llu lrb lri lrr lrt lru ltb lte lti ltl ltr ltt ltu lub lue lui lul lur lut luu rbb rbe rbi rbl rbr rbt rbu re- reb ree rei rel rer ret reu rib rie rii ril rir rit rle rli rll rlr rlt rlu rrb rri rrl rrr rrt rru rtb rte rti rtl rtr rtt rtu rub rue rui rur rut ruu tbb tbe tbi tbl tbr tbt tbu te- teb tee tei tel ter tet teu tib tie tii til tir tit tiu tle tli tll tlr tlt tlu trb tre tri trl trr trt tru ttb tte tti ttl ttr ttt ttu tub tue tui tul tur tut tuu ubb ube ubi ubl ubr ubt ubu ueb uee uei uel uer uet uib uie uii uil uir uit uiu ulb ule uli ull ulr ult ulu ur- urb ure uri url urr urt uru utb ute uti utl utr utt utu uue uur uut uuu