-er -ol bbb bbe bbf bbi bbk bbl bbo bbr be- beb bee bef bei bek bel beo ber bfb bfe bff bfi bfl bfo bfr bi- bib bie bif bii bik bil bio bir bkb bke bkf bkk bkl bko bkr blb ble blf bli blk bll blo blr bob boe bof boi bok bol boo bor brb bre brf bri brk brl bro brr ebb ebe ebf ebi ebk ebl ebo ebr eeb eee eef eek eel eeo eer ef- efb efe eff efi efl efo efr eib eie eif eii eik eil eio eir ekb eke ekf eki ekl eko ekr elb ele elf eli elk ell elo elr eo- eob eoe eof eoi eok eol eoo eor erb ere erf eri erk erl ero err fbb fbe fbf fbi fbk fbl fbo fbr feb fee fef fei fek fel feo fer ffe fff ffi ffk ffl ffo ffr fib fie fif fii fik fil fir fkb fkf fki fkk fkl flb fle flf fli fll flo flr fob foe fof foi fok fol foo for frb fre frf fri frk frl fro frr i-f ibb ibe ibf ibi ibk ibl ibo ibr ie- iee ief iei iek iel ier ifb ife iff ifi ifl ifo ifr iib iie iif iii iil iio iir ikb ike ikf iki ikk ikl iko ikr il- ilb ile ilf ili ilk ill ilo ilr io- iob ioe iof ioi iol ioo ior ir- irb ire irf iri irk irl iro irr kbb kbe kbf kbi kbk kbl kbo kbr ke- keb kee kef kei kek kel keo ker kff kfi kfo kib kie kif kii kik kil kio kir kkb kke kki kkk kkl kkr kl- klb klf kli klo klr kob koe kof koi kok kol koo kor krf kri krk krl kro krr lbb lbe lbf lbi lbk lbl lbo lbr leb lee lef lei lek lel leo ler lfb lfe lff lfi lfk lfl lfo lfr lib lie lif lii lik lil lio lir lkb lkl lkr llb lle llf lli llk lll llo llr lob loe lof loi lok lol loo lor lrb lrf lri lrk lro lrr o-i ob- obb obe obf obi obk obl obo obr oeb oee oef oei oel oeo oer of- ofb ofe off ofi ofl ofo ofr oib oie oif oii oik oil oio oir okb oke oki okk okl oko okr olb ole olf oli olk oll olo oo- oob oof ooi ook ool ooo oor or- orb ore orf ori ork orl oro orr rbb rbe rbf rbi rbk rbl rbo rbr re- reb ree ref rei rek rel reo rer rfb rfe rff rfi rfk rfl rfo rfr rib rie rif rii rik ril rio rir rkb rke rkf rkk rko rle rlf rli rll rlo rlr rob roe rof roi rok rol roo ror rrb rrf rri rrk rrl rrr