-er -ol bbb bbe bbl bbo bbr be- beb bee bel beo ber blb ble bll blo blr bob boe bol boo bor brb bre brl bro brr ebb ebe ebl ebo ebr eeb eee eel eeo eer elb ele ell elo elr eo- eob eoe eol eoo eor erb ere erl ero err lbb lbe lbl lbo lbr leb lee lel leo ler llb lle lll llo llr lob loe lol loo lor lrb lro lrr ob- obb obe obl obo obr oeb oee oel oeo oer olb ole oll olo oo- oob ool ooo oor or- orb ore orl oro orr rbb rbe rbl rbo rbr re- reb ree rel reo rer rle rll rlo rlr rob roe rol roo ror rrb rrl rrr