-er -ol bbb bbe bbi bbl bbo bbr be- beb bee bei bel beo ber bi- bib bie bii bil bio bir blb ble bli bll blo blr bob boe boi bol boo bor brb bre bri brl bro brr ebb ebe ebi ebl ebo ebr eeb eee eel eeo eer eib eie eii eil eio eir elb ele eli ell elo elr eo- eob eoe eoi eol eoo eor erb ere eri erl ero err ibb ibe ibi ibl ibo ibr ie- iee iei iel ier iib iie iii iil iio iir il- ilb ile ili ill ilo ilr io- iob ioe ioi iol ioo ior ir- irb ire iri irl iro irr lbb lbe lbi lbl lbo lbr leb lee lei lel leo ler lib lie lii lil lio lir llb lle lli lll llo llr lob loe loi lol loo lor lrb lri lro lrr o-i ob- obb obe obi obl obo obr oeb oee oei oel oeo oer oib oie oii oil oio oir olb ole oli oll olo oo- oob ooi ool ooo oor or- orb ore ori orl oro orr rbb rbe rbi rbl rbo rbr re- reb ree rei rel reo rer rib rie rii ril rio rir rle rli rll rlo rlr rob roe roi rol roo ror rrb rri rrl rrr