-er -ol bbb bbe bbl bbo bbr bbx be- beb bee bel beo ber bex blb ble bll blo blr blx bob boe bol boo bor box brb bre brl bro brr brx bxb bxl bxo bxx ebb ebe ebl ebo ebr ebx eeb eee eel eeo eer eex elb ele ell elo elr elx eo- eob eoe eol eoo eor erb ere erl ero err ex- exe exl exo exr exx lbb lbe lbl lbo lbr lbx leb lee lel leo ler lex llb lle lll llo llr lob loe lol loo lor lox lrb lro lrr lxo lxr lxx ob- obb obe obl obo obr obx oeb oee oel oeo oer oex olb ole oll olo oo- oob ool ooo oor oox or- orb ore orl oro orr orx ox- oxb oxo oxx rbb rbe rbl rbo rbr rbx re- reb ree rel reo rer rex rle rll rlo rlr rob roe rol roo ror rox rrb rrl rrr rxr xbe xbl xbr xbx xee xel xer xex xlb xlr xoo xor xox xrx xxl xxo xxx