-er bbb bbd bbe bbk bbn bbo bbr bbs bdb bdd bde bdk bdo bdr bds be- beb bed bee bek ben beo ber bes bkb bke bkk bkn bko bkr bks bnb bnd bne bnk bnn bno bnr bns bob bod boe bok bon boo bor bos brb brd bre brk brn bro brr brs bsb bsd bse bsk bsn bso bsr bss dbb dbd dbe dbk dbn dbo dbr dbs ddb ddd dde ddk ddn ddo ddr dds de- deb ded dee dek den deo der des dkb dke dkk dko dkr dks dnb dnd dne dnk dnn dno dnr dns dob dod doe dok don doo dor dos drb drd dre drk drn dro drr drs dsb dsd dse dsk dsn dso dsr dss ebb ebd ebe ebk ebn ebo ebr ebs ed- edb edd ede edk edn edo edr eds eeb eed eee eek een eeo eer ees ekb ekd eke eko ekr eks en- enb end ene enk enn eno enr ens eo- eob eod eoe eok eon eoo eor eos erb erd ere erk ern ero err ers es- esb esd ese esk esn eso esr ess kbb kbd kbe kbk kbn kbo kbr kbs kdb kde kdk kdo kdr kds ke- keb ked kee kek ken keo ker kes kkb kke kkk kkn kkr kks kn- knd kne knk knn kno knr kob kod koe kok kon koo kor kos krd krk krn kro krr krs ksb ksd kse ksk ksn kso ksr kss nbb nbd nbe nbk nbn nbo nbr nbs ndb ndd nde ndk ndn ndo ndr nds ne- neb ned nee nek nen neo ner nes nke nkk nkn nko nkr nks nnb nne nnk nnn nno nns no- nob nod noe nok non noo nor nos nrb nrd nre nrk nrn nro nrr nrs nsb nsd nse nsk nsn nso nsr nss ob- obb obd obe obk obn obo obr obs odb odd ode odn odo odr ods oeb oed oee oen oeo oer oes okb okd oke okk oko okr oks on- onb ond one onk onn ono onr ons oo- oob ood ook oon ooo oor oos or- orb ord ore ork orn oro orr ors os- osb osd ose osk osn oso osr oss rbb rbd rbe rbk rbn rbo rbr rbs rdb rdd rde rdn rdo rdr rds re- reb red ree rek ren reo rer res rkb rke rkk rko rks rnb rnd rnn rno rnr rns rob rod roe rok ron roo ror ros rrb rrd rrk rrn rrr rrs rsb rsd rse rsk rsn rso rsr rss sbb sbd sbe sbk sbn sbo sbr sbs sdb sdd sde sdk sdn sdo sdr sds se- seb sed see sek sen seo ser ses sk- skb skd ske skk sko skr sks snb snd sne snk snn sno snr sns sob sod soe sok son soo sor sos sr- srb srd sre srk srn sro srr srs ss- ssb ssd sse ssk ssn sso ssr sss