-er -ol bbb bbd bbe bbk bbl bbo bbr bdb bdd bde bdk bdl bdo bdr be- beb bed bee bek bel beo ber bkb bke bkk bkl bko bkr blb bld ble blk bll blo blr bob bod boe bok bol boo bor brb brd bre brk brl bro brr dbb dbd dbe dbk dbl dbo dbr ddb ddd dde ddk ddl ddo ddr de- deb ded dee dek del deo der dkb dke dkk dkl dko dkr dl- dlb dld dle dlk dll dlo dlr dob dod doe dok dol doo dor drb drd dre drk drl dro drr ebb ebd ebe ebk ebl ebo ebr ed- edb edd ede edk edl edo edr eeb eed eee eek eel eeo eer ekb ekd eke ekl eko ekr elb eld ele elk ell elo elr eo- eob eod eoe eok eol eoo eor erb erd ere erk erl ero err kbb kbd kbe kbk kbl kbo kbr kdb kde kdk kdl kdo kdr ke- keb ked kee kek kel keo ker kkb kke kkk kkl kkr kl- klb kld klo klr kob kod koe kok kol koo kor krd krk krl kro krr lbb lbd lbe lbk lbl lbo lbr ldb ldd lde ldk ldl ldo ldr leb led lee lek lel leo ler lkb lkl lkr llb lld lle llk lll llo llr lob lod loe lok lol loo lor lrb lrd lrk lro lrr ob- obb obd obe obk obl obo obr odb odd ode odl odo odr oeb oed oee oel oeo oer okb okd oke okk okl oko okr olb old ole olk oll olo oo- oob ood ook ool ooo oor or- orb ord ore ork orl oro orr rbb rbd rbe rbk rbl rbo rbr rdb rdd rde rdl rdo rdr re- reb red ree rek rel reo rer rkb rke rkk rko rld rle rll rlo rlr rob rod roe rok rol roo ror rrb rrd rrk rrl rrr