-er -ol bbb bbe bbf bbl bbn bbo bbr bbs be- beb bee bef bel ben beo ber bes bfb bfe bff bfl bfn bfo bfr bfs blb ble blf bll bln blo blr bls bnb bne bnf bnl bnn bno bnr bns bob boe bof bol bon boo bor bos brb bre brf brl brn bro brr brs bsb bse bsf bsl bsn bso bsr bss ebb ebe ebf ebl ebn ebo ebr ebs eeb eee eef eel een eeo eer ees ef- efb efe eff efl efo efr efs elb ele elf ell eln elo elr els en- enb ene enf enl enn eno enr ens eo- eob eoe eof eol eon eoo eor eos erb ere erf erl ern ero err ers es- esb ese esf esl esn eso esr ess fbb fbe fbf fbl fbn fbo fbr fbs feb fee fef fel fen feo fer fes ffe fff ffl ffn ffo ffr ffs flb fle flf fll fln flo flr fls fnb fne fnf fnl fnn fnr fns fob foe fof fol fon foo for fos frb fre frf frl frn fro frr frs fsb fse fsf fsl fsn fso fsr fss lbb lbe lbf lbl lbo lbr lbs leb lee lef lel len leo ler les lfb lfe lff lfl lfn lfo lfr lfs llb lle llf lll lln llo llr lls lnb lne lnl lnn lno lnr lns lob loe lof lol lon loo lor los lrb lrf lrn lro lrr lrs lsb lse lsf lsl lsn lso lsr lss nbb nbe nbf nbl nbn nbo nbr nbs ne- neb nee nef nel nen neo ner nes nfb nfe nff nfl nfn nfo nfr nfs nlb nle nlf nll nln nlo nlr nls nnb nne nnf nnl nnn nno nns no- nob noe nof nol non noo nor nos nrb nre nrf nrl nrn nro nrr nrs nsb nse nsf nsl nsn nso nsr nss ob- obb obe obf obl obn obo obr obs oeb oee oef oel oen oeo oer oes of- ofb ofe off ofl ofn ofo ofr ofs olb ole olf oll oln olo ols on- onb one onf onl onn ono onr ons oo- oob oof ool oon ooo oor oos or- orb ore orf orl orn oro orr ors os- osb ose osf osl osn oso osr oss rbb rbe rbf rbl rbn rbo rbr rbs re- reb ree ref rel ren reo rer res rfb rfe rff rfl rfn rfo rfr rfs rle rlf rll rln rlo rlr rls rnb rnn rno rnr rns rob roe rof rol ron roo ror ros rrb rrf rrl rrn rrr rrs rsb rse rsf rsl rsn rso rsr rss sbb sbe sbf sbl sbn sbo sbr sbs se- seb see sef sel sen seo ser ses sfb sfe sff sfl sfn sfo sfr sfs slb sle slf sll sln slo slr sls snb sne snf snl snn sno snr sns sob soe sof sol son soo sor sos sr- srb sre srf srl srn sro srr srs ss- ssb sse ssf ssl ssn sso ssr sss