-er -ol bbb bbe bbf bbl bbm bbn bbo bbr be- beb bee bef bel bem ben beo ber bfb bfe bff bfl bfm bfn bfo bfr blb ble blf bll blm bln blo blr bmb bme bmf bml bmm bmn bmo bmr bnb bne bnf bnl bnn bno bnr bob boe bof bol bom bon boo bor brb bre brf brl brm brn bro brr ebb ebe ebf ebl ebm ebn ebo ebr eeb eee eef eel eem een eeo eer ef- efb efe eff efl efm efo efr elb ele elf ell elm eln elo elr em- emb eme emf eml emm emn emo emr en- enb ene enf enl enm enn eno enr eo- eob eoe eof eol eom eon eoo eor erb ere erf erl erm ern ero err fbb fbe fbf fbl fbm fbn fbo fbr feb fee fef fel fem fen feo fer ffe fff ffl ffm ffn ffo ffr flb fle flf fll flm fln flo flr fmb fme fmf fml fmm fmn fmo fmr fnb fne fnf fnl fnm fnn fnr fob foe fof fol fom fon foo for frb fre frf frl frm frn fro frr lbb lbe lbf lbl lbm lbo lbr leb lee lef lel lem len leo ler lfb lfe lff lfl lfm lfn lfo lfr llb lle llf lll llm lln llo llr lmb lme lmf lml lmm lmn lmo lmr lnb lne lnl lnm lnn lno lnr lob loe lof lol lom lon loo lor lrb lrf lrm lrn lro lrr m-f m-o m-r mbb mbe mbf mbl mbm mbo mbr meb mee mef mel mem men meo mer mfb mfe mff mfl mfm mfn mfo mfr mlb mle mlf mll mlm mln mlo mlr mmb mme mmf mml mmm mmn mmo mmr mnb mne mnf mnl mnm mnn mno mnr mob moe mof mol mom mon moo mor mrb mre mrf mrl mrm mrn mro mrr nbb nbe nbf nbl nbm nbn nbo nbr ne- neb nee nef nel nem nen neo ner nfb nfe nff nfl nfn nfo nfr nlb nle nlf nll nlm nln nlo nlr nmb nme nml nmm nmn nmo nmr nnb nne nnf nnl nnm nnn nno no- nob noe nof nol nom non noo nor nrb nre nrf nrl nrm nrn nro nrr ob- obb obe obf obl obm obn obo obr oeb oee oef oel oem oen oeo oer of- ofb ofe off ofl ofm ofn ofo ofr olb ole olf oll olm oln olo om- omb ome omf oml omm omn omo omr on- onb one onf onl onn ono onr oo- oob oof ool oom oon ooo oor or- orb ore orf orl orm orn oro orr rbb rbe rbf rbl rbm rbn rbo rbr re- reb ree ref rel rem ren reo rer rfb rfe rff rfl rfm rfn rfo rfr rle rlf rll rlm rln rlo rlr rmb rme rmf rml rmm rmn rmo rmr rnb rnm rnn rno rnr rob roe rof rol rom ron roo ror rrb rrf rrl rrm rrn rrr