-er bbb bbd bbe bbk bbn bbo bbr bdb bdd bde bdk bdo bdr be- beb bed bee bek ben beo ber bkb bke bkk bkn bko bkr bnb bnd bne bnk bnn bno bnr bob bod boe bok bon boo bor brb brd bre brk brn bro brr dbb dbd dbe dbk dbn dbo dbr ddb ddd dde ddk ddn ddo ddr de- deb ded dee dek den deo der dkb dke dkk dko dkr dnb dnd dne dnk dnn dno dnr dob dod doe dok don doo dor drb drd dre drk drn dro drr ebb ebd ebe ebk ebn ebo ebr ed- edb edd ede edk edn edo edr eeb eed eee eek een eeo eer ekb ekd eke eko ekr en- enb end ene enk enn eno enr eo- eob eod eoe eok eon eoo eor erb erd ere erk ern ero err kbb kbd kbe kbk kbn kbo kbr kdb kde kdk kdo kdr ke- keb ked kee kek ken keo ker kkb kke kkk kkn kkr kn- knd kne knk knn kno knr kob kod koe kok kon koo kor krd krk krn kro krr nbb nbd nbe nbk nbn nbo nbr ndb ndd nde ndk ndn ndo ndr ne- neb ned nee nek nen neo ner nke nkk nkn nko nkr nnb nne nnk nnn nno no- nob nod noe nok non noo nor nrb nrd nre nrk nrn nro nrr ob- obb obd obe obk obn obo obr odb odd ode odn odo odr oeb oed oee oen oeo oer okb okd oke okk oko okr on- onb ond one onk onn ono onr oo- oob ood ook oon ooo oor or- orb ord ore ork orn oro orr rbb rbd rbe rbk rbn rbo rbr rdb rdd rde rdn rdo rdr re- reb red ree rek ren reo rer rkb rke rkk rko rnb rnd rnn rno rnr rob rod roe rok ron roo ror rrb rrd rrk rrn rrr