-er -ol bbb bbe bbf bbg bbl bbn bbo bbr be- beb bee bef beg bel ben beo ber bfb bfe bff bfg bfl bfn bfo bfr bgb bge bgf bgg bgl bgn bgo bgr blb ble blf blg bll bln blo blr bnb bne bnf bng bnl bnn bno bnr bob boe bof bog bol bon boo bor brb bre brf brg brl brn bro brr ebb ebe ebf ebg ebl ebn ebo ebr eeb eee eef eeg eel een eeo eer ef- efb efe eff efg efl efo efr egb ege egf egg egl egn ego egr elb ele elf elg ell eln elo elr en- enb ene enf eng enl enn eno enr eo- eob eoe eof eog eol eon eoo eor erb ere erf erg erl ern ero err fbb fbe fbf fbg fbl fbn fbo fbr feb fee fef feg fel fen feo fer ffe fff ffg ffl ffn ffo ffr fgb fge fgf fgg fgl fgn fgr flb fle flf flg fll fln flo flr fnb fne fnf fng fnl fnn fnr fob foe fof fog fol fon foo for frb fre frf frg frl frn fro frr gbe gbf gbg gbl gbn gbo gbr ge- geb gee gef geg gel gen geo ger gfb gfe gff gfl gfo gfr ggb ggg ggn ggo ggr glb gle glf glg gll gln glo glr gnb gne gnf gnl gnn gno gnr gob goe gof gog gol gon goo gor grb gre grf grg grl grn gro grr lbb lbe lbf lbg lbl lbo lbr leb lee lef leg lel len leo ler lfb lfe lff lfg lfl lfn lfo lfr lgb lge lgf lgg lgl lgn lgo lgr llb lle llf llg lll lln llo llr lnb lne lng lnl lnn lno lnr lob loe lof log lol lon loo lor lrb lrf lrg lrn lro lrr nbb nbe nbf nbg nbl nbn nbo nbr ne- neb nee nef neg nel nen neo ner nfb nfe nff nfl nfn nfo nfr ngb nge ngf ngg ngl ngn ngo nlb nle nlf nlg nll nln nlo nlr nnb nne nnf nng nnl nnn nno no- nob noe nof nog nol non noo nor nrb nre nrf nrg nrl nrn nro nrr ob- obb obe obf obg obl obn obo obr oeb oee oef oeg oel oen oeo oer of- ofb ofe off ofg ofl ofn ofo ofr oge ogf ogg ogl ogn ogo olb ole olf olg oll oln olo on- onb one onf ong onl onn ono onr oo- oob oof oog ool oon ooo oor or- orb ore orf org orl orn oro orr rbb rbe rbf rbg rbl rbn rbo rbr re- reb ree ref reg rel ren reo rer rfb rfe rff rfg rfl rfn rfo rfr rgb rge rgf rgg rgn rgo rgr rle rlf rlg rll rln rlo rlr rnb rng rnn rno rnr rob roe rof rog rol ron roo ror rrb rrf rrg rrl rrn rrr