-er bbb bbe bbi bbl bbr be- beb bee bei bel ber bi- bib bie bii bil bir blb ble bli bll blr brb bre bri brl brr ebb ebe ebi ebl ebr eeb eee eel eer eib eie eii eil eir elb ele eli ell elr erb ere eri erl err ibb ibe ibi ibl ibr ie- iee iei iel ier iib iie iii iil iir il- ilb ile ili ill ilr ir- irb ire iri irl irr lbb lbe lbi lbl lbr leb lee lei lel ler lib lie lii lil lir llb lle lli lll llr lrb lri lrr rbb rbe rbi rbl rbr re- reb ree rei rel rer rib rie rii ril rir rle rli rll rlr rrb rri rrl rrr