-er bbb bbd bbe bbn bbo bbr bdb bdd bde bdo bdr bdv be- beb bed bee ben beo ber bev bnb bnd bne bnn bno bnr bnv bob bod boe bon boo bor bov brb brd bre brn bro brr brv bvb bvd bve bvn bvo bvr bvv dbb dbd dbe dbn dbo dbr dbv ddb ddd dde ddn ddo ddr de- deb ded dee den deo der dev dnb dnd dne dnn dno dnr dob dod doe don doo dor dov drb drd dre drn dro drr drv dvb dvd dve dvn dvr ebb ebd ebe ebn ebo ebr ebv ed- edb edd ede edn edo edr eeb eed eee een eeo eer eev en- enb end ene enn eno enr env eo- eob eod eoe eon eoo eor erb erd ere ern ero err erv evb evd eve evn evo evr evv nbb nbd nbe nbn nbo nbr nbv ndb ndd nde ndn ndo ndr ndv ne- neb ned nee nen neo ner nev nnb nne nnn nno nnv no- nob nod noe non noo nor nov nrb nrd nre nrn nro nrr nrv nvb nvd nve nvn nvv ob- obb obd obe obn obo obr obv odb odd ode odn odo odr odv oeb oed oee oen oeo oer on- onb ond one onn ono onr oo- oob ood oon ooo oor oov or- orb ord ore orn oro orr orv ov- ovb ovd ove ovo ovv rbb rbd rbe rbn rbo rbr rdb rdd rde rdn rdo rdr rdv re- reb red ree ren reo rer rev rnb rnd rnn rno rnr rnv rob rod roe ron roo ror rov rrb rrd rrn rrr rvb rvd rve rvn rvo rvr rvv v-e vbd vbo vbr vbv vdb vdd vde vdo vdr vdv veb ved vee ven veo ver vn- vnd vno vnr vnv vob vod voe von voo vor vov vrb vrd vre vrn vrr vvb vvo vvr vvv