-er bbb bbd bbe bbn bbo bbr bbs bdb bdd bde bdo bdr bds be- beb bed bee ben beo ber bes bnb bnd bne bnn bno bnr bns bob bod boe bon boo bor bos brb brd bre brn bro brr brs bsb bsd bse bsn bso bsr bss dbb dbd dbe dbn dbo dbr dbs ddb ddd dde ddn ddo ddr dds de- deb ded dee den deo der des dnb dnd dne dnn dno dnr dns dob dod doe don doo dor dos drb drd dre drn dro drr drs dsb dsd dse dsn dso dsr dss ebb ebd ebe ebn ebo ebr ebs ed- edb edd ede edn edo edr eds eeb eed eee een eeo eer ees en- enb end ene enn eno enr ens eo- eob eod eoe eon eoo eor eos erb erd ere ern ero err ers es- esb esd ese esn eso esr ess nbb nbd nbe nbn nbo nbr nbs ndb ndd nde ndn ndo ndr nds ne- neb ned nee nen neo ner nes nnb nne nnn nno nns no- nob nod noe non noo nor nos nrb nrd nre nrn nro nrr nrs nsb nsd nse nsn nso nsr nss ob- obb obd obe obn obo obr obs odb odd ode odn odo odr ods oeb oed oee oen oeo oer oes on- onb ond one onn ono onr ons oo- oob ood oon ooo oor oos or- orb ord ore orn oro orr ors os- osb osd ose osn oso osr oss rbb rbd rbe rbn rbo rbr rbs rdb rdd rde rdn rdo rdr rds re- reb red ree ren reo rer res rnb rnd rnn rno rnr rns rob rod roe ron roo ror ros rrb rrd rrn rrr rrs rsb rsd rse rsn rso rsr rss sbb sbd sbe sbn sbo sbr sbs sdb sdd sde sdn sdo sdr sds se- seb sed see sen seo ser ses snb snd sne snn sno snr sns sob sod soe son soo sor sos sr- srb srd sre srn sro srr srs ss- ssb ssd sse ssn sso ssr sss