-er -ol bbb bbd bbe bbf bbk bbl bbn bbo bbr bbs bdb bdd bde bdf bdk bdl bdo bdr bds be- beb bed bee bef bek bel ben beo ber bes bfb bfd bfe bff bfl bfn bfo bfr bfs bkb bke bkf bkk bkl bkn bko bkr bks blb bld ble blf blk bll bln blo blr bls bnb bnd bne bnf bnk bnl bnn bno bnr bns bob bod boe bof bok bol bon boo bor bos brb brd bre brf brk brl brn bro brr brs bsb bsd bse bsf bsk bsl bsn bso bsr bss dbb dbd dbe dbf dbk dbl dbn dbo dbr dbs ddb ddd dde ddf ddk ddl ddn ddo ddr dds de- deb ded dee def dek del den deo der des dfb dfd dfe dff dfk dfl dfn dfo dfr dfs dkb dke dkk dkl dko dkr dks dl- dlb dld dle dlf dlk dll dlo dlr dls dnb dnd dne dnf dnk dnl dnn dno dnr dns dob dod doe dof dok dol don doo dor dos drb drd dre drk drl drn dro drr drs dsb dsd dse dsf dsk dsl dsn dso dsr dss ebb ebd ebe ebf ebk ebl ebn ebo ebr ebs ed- edb edd ede edf edk edl edn edo edr eds eeb eed eee eef eek eel een eeo eer ees ef- efb efd efe eff efl efo efr efs ekb ekd eke ekf ekl eko ekr eks elb eld ele elf elk ell eln elo elr els en- enb end ene enf enk enl enn eno enr ens eo- eob eod eoe eof eok eol eon eoo eor eos erb erd ere erf erk erl ern ero err ers es- esb esd ese esf esk esl esn eso esr ess fbb fbd fbe fbf fbk fbl fbn fbo fbr fbs fdb fdd fde fdf fdk fdl fdn fdo fdr fds feb fed fee fef fek fel fen feo fer fes ffd ffe fff ffk ffl ffn ffo ffr ffs fkb fkf fkk fkl flb fld fle flf fll fln flo flr fls fnb fnd fne fnf fnk fnl fnn fnr fns fob foe fof fok fol fon foo for fos frb frd fre frf frk frl frn fro frr frs fsb fsd fse fsf fsk fsl fsn fso fsr fss kbb kbd kbe kbf kbk kbl kbn kbo kbr kbs kdb kde kdf kdk kdl kdo kdr kds ke- keb ked kee kef kek kel ken keo ker kes kfd kff kfo kfs kkb kke kkk kkl kkn kkr kks kl- klb kld klf klo klr kls kn- knd kne knf knk knl knn kno knr kob kod koe kof kok kol kon koo kor kos krd krf krk krl krn kro krr krs ksb ksd kse ksf ksk ksl ksn kso ksr kss lbb lbd lbe lbf lbk lbl lbo lbr lbs ldb ldd lde ldf ldk ldl ldn ldo ldr lds leb led lee lef lek lel len leo ler les lfb lfd lfe lff lfk lfl lfn lfo lfr lfs lkb lkl lkr lks llb lld lle llf llk lll lln llo llr lls lnb lnd lne lnk lnl lnn lno lnr lns lob lod loe lof lok lol lon loo lor los lrb lrd lrf lrk lrn lro lrr lrs lsb lsd lse lsf lsk lsl lsn lso lsr lss nbb nbd nbe nbf nbk nbl nbn nbo nbr nbs ndb ndd nde ndf ndk ndl ndn ndo ndr nds ne- neb ned nee nef nek nel nen neo ner nes nfb nfd nfe nff nfk nfl nfn nfo nfr nfs nke nkf nkk nkn nko nkr nks nlb nld nle nlf nlk nll nln nlo nlr nls nnb nne nnf nnk nnl nnn nno nns no- nob nod noe nof nok nol non noo nor nos nrb nrd nre nrf nrk nrl nrn nro nrr nrs nsb nsd nse nsf nsk nsl nsn nso nsr nss ob- obb obd obe obf obk obl obn obo obr obs odb odd ode odf odl odn odo odr ods oeb oed oee oef oel oen oeo oer oes of- ofb ofd ofe off ofl ofn ofo ofr ofs okb okd oke okk okl oko okr oks olb old ole olf olk oll oln olo ols on- onb ond one onf onk onl onn ono onr ons oo- oob ood oof ook ool oon ooo oor oos or- orb ord ore orf ork orl orn oro orr ors os- osb osd ose osf osk osl osn oso osr oss rbb rbd rbe rbf rbk rbl rbn rbo rbr rbs rdb rdd rde rdf rdl rdn rdo rdr rds re- reb red ree ref rek rel ren reo rer res rfb rfd rfe rff rfk rfl rfn rfo rfr rfs rkb rke rkf rkk rko rks rld rle rlf rll rln rlo rlr rls rnb rnd rnn rno rnr rns rob rod roe rof rok rol ron roo ror ros rrb rrd rrf rrk rrl rrn rrr rrs rsb rsd rse rsf rsk rsl rsn rso rsr rss sbb sbd sbe sbf sbk sbl sbn sbo sbr sbs sdb sdd sde sdf sdk sdl sdn sdo sdr sds se- seb sed see sef sek sel sen seo ser ses sfb sfd sfe sff sfk sfl sfn sfo sfr sfs sk- skb skd ske skf skk skl sko skr sks slb sld sle slf slk sll sln slo slr sls snb snd sne snf snk snl snn sno snr sns sob sod soe sof sok sol son soo sor sos sr- srb srd sre srf srk srl srn sro srr srs ss- ssb ssd sse ssf ssk ssl ssn sso ssr sss