-er bbb bbd bbe bbn bbo bbr bdb bdd bde bdo bdr be- beb bed bee ben beo ber bnb bnd bne bnn bno bnr bob bod boe bon boo bor brb brd bre brn bro brr dbb dbd dbe dbn dbo dbr ddb ddd dde ddn ddo ddr de- deb ded dee den deo der dnb dnd dne dnn dno dnr dob dod doe don doo dor drb drd dre drn dro drr ebb ebd ebe ebn ebo ebr ed- edb edd ede edn edo edr eeb eed eee een eeo eer en- enb end ene enn eno enr eo- eob eod eoe eon eoo eor erb erd ere ern ero err nbb nbd nbe nbn nbo nbr ndb ndd nde ndn ndo ndr ne- neb ned nee nen neo ner nnb nne nnn nno no- nob nod noe non noo nor nrb nrd nre nrn nro nrr ob- obb obd obe obn obo obr odb odd ode odn odo odr oeb oed oee oen oeo oer on- onb ond one onn ono onr oo- oob ood oon ooo oor or- orb ord ore orn oro orr rbb rbd rbe rbn rbo rbr rdb rdd rde rdn rdo rdr re- reb red ree ren reo rer rnb rnd rnn rno rnr rob rod roe ron roo ror rrb rrd rrn rrr