-er -ol bbb bbd bbe bbl bbo bbr bdb bdd bde bdl bdo bdr be- beb bed bee bel beo ber blb bld ble bll blo blr bob bod boe bol boo bor brb brd bre brl bro brr dbb dbd dbe dbl dbo dbr ddb ddd dde ddl ddo ddr de- deb ded dee del deo der dl- dlb dld dle dll dlo dlr dob dod doe dol doo dor drb drd dre drl dro drr ebb ebd ebe ebl ebo ebr ed- edb edd ede edl edo edr eeb eed eee eel eeo eer elb eld ele ell elo elr eo- eob eod eoe eol eoo eor erb erd ere erl ero err lbb lbd lbe lbl lbo lbr ldb ldd lde ldl ldo ldr leb led lee lel leo ler llb lld lle lll llo llr lob lod loe lol loo lor lrb lrd lro lrr ob- obb obd obe obl obo obr odb odd ode odl odo odr oeb oed oee oel oeo oer olb old ole oll olo oo- oob ood ool ooo oor or- orb ord ore orl oro orr rbb rbd rbe rbl rbo rbr rdb rdd rde rdl rdo rdr re- reb red ree rel reo rer rld rle rll rlo rlr rob rod roe rol roo ror rrb rrd rrl rrr