-er -ol bbb bbd bbe bbk bbl bbn bbo bbr bdb bdd bde bdk bdl bdo bdr be- beb bed bee bek bel ben beo ber bkb bke bkk bkl bkn bko bkr blb bld ble blk bll bln blo blr bnb bnd bne bnk bnl bnn bno bnr bob bod boe bok bol bon boo bor brb brd bre brk brl brn bro brr dbb dbd dbe dbk dbl dbn dbo dbr ddb ddd dde ddk ddl ddn ddo ddr de- deb ded dee dek del den deo der dkb dke dkk dkl dko dkr dl- dlb dld dle dlk dll dlo dlr dnb dnd dne dnk dnl dnn dno dnr dob dod doe dok dol don doo dor drb drd dre drk drl drn dro drr ebb ebd ebe ebk ebl ebn ebo ebr ed- edb edd ede edk edl edn edo edr eeb eed eee eek eel een eeo eer ekb ekd eke ekl eko ekr elb eld ele elk ell eln elo elr en- enb end ene enk enl enn eno enr eo- eob eod eoe eok eol eon eoo eor erb erd ere erk erl ern ero err kbb kbd kbe kbk kbl kbn kbo kbr kdb kde kdk kdl kdo kdr ke- keb ked kee kek kel ken keo ker kkb kke kkk kkl kkn kkr kl- klb kld klo klr kn- knd kne knk knl knn kno knr kob kod koe kok kol kon koo kor krd krk krl krn kro krr lbb lbd lbe lbk lbl lbo lbr ldb ldd lde ldk ldl ldn ldo ldr leb led lee lek lel len leo ler lkb lkl lkr llb lld lle llk lll lln llo llr lnb lnd lne lnk lnl lnn lno lnr lob lod loe lok lol lon loo lor lrb lrd lrk lrn lro lrr nbb nbd nbe nbk nbl nbn nbo nbr ndb ndd nde ndk ndl ndn ndo ndr ne- neb ned nee nek nel nen neo ner nke nkk nkn nko nkr nlb nld nle nlk nll nln nlo nlr nnb nne nnk nnl nnn nno no- nob nod noe nok nol non noo nor nrb nrd nre nrk nrl nrn nro nrr ob- obb obd obe obk obl obn obo obr odb odd ode odl odn odo odr oeb oed oee oel oen oeo oer okb okd oke okk okl oko okr olb old ole olk oll oln olo on- onb ond one onk onl onn ono onr oo- oob ood ook ool oon ooo oor or- orb ord ore ork orl orn oro orr rbb rbd rbe rbk rbl rbn rbo rbr rdb rdd rde rdl rdn rdo rdr re- reb red ree rek rel ren reo rer rkb rke rkk rko rld rle rll rln rlo rlr rnb rnd rnn rno rnr rob rod roe rok rol ron roo ror rrb rrd rrk rrl rrn rrr