-er b-u bbb bbd bbe bbn bbo bbr bbu bdb bdd bde bdo bdr bdu be- beb bed bee ben beo ber beu bnb bnd bne bnn bno bnr bnu bob bod boe bon boo bor bou brb brd bre brn bro brr bru bub bud bue bun buo bur buu dbb dbd dbe dbn dbo dbr dbu ddb ddd dde ddn ddo ddr ddu de- deb ded dee den deo der deu dnb dnd dne dnn dno dnr dob dod doe don doo dor dou drb drd dre drn dro drr dru dub dud due dun duo dur ebb ebd ebe ebn ebo ebr ebu ed- edb edd ede edn edo edr edu eeb eed eee een eeo eer en- enb end ene enn eno enr enu eo- eob eod eoe eon eoo eor eou erb erd ere ern ero err eru eu- eub eud eue eun eur nbb nbd nbe nbn nbo nbr nbu ndb ndd nde ndn ndo ndr ndu ne- neb ned nee nen neo ner neu nnb nne nnn nno nnu no- nob nod noe non noo nor nou nrb nrd nre nrn nro nrr nru nub nud nue nun nuo nur nuu ob- obb obd obe obn obo obr obu odb odd ode odn odo odr odu oeb oed oee oen oeo oer on- onb ond one onn ono onr onu oo- oob ood oon ooo oor or- orb ord ore orn oro orr oru ou- oud oue oun ouo our rbb rbd rbe rbn rbo rbr rbu rdb rdd rde rdn rdo rdr rdu re- reb red ree ren reo rer reu rnb rnd rnn rno rnr rnu rob rod roe ron roo ror rou rrb rrd rrn rrr rru rub rud rue run ruo rur ruu ubb ube ubn ubo ubr ubu udb udd ude udn udo udr udu ueb ued uee uen uer un- unb und une unn uno unr unu uob uod uoe uon uoo uor ur- urb urd ure urn uro urr uru uue uun uur uuu