-al -er -ol a-a a-b aaa aab aae aaf aak aal aao aar ab- aba abb abe abf abk abl abo abr aea aeb aee aef aek ael aeo aer af- afa afb afe aff afk afl afo afr aka akb ake akk akl ako akr al- ala alb ale alf alk all alo alr aoa aob aoe aof aok aol aoo aor ar- ara arb are arf ark arl aro arr baa bab bae baf bak bal bao bar bba bbb bbe bbf bbk bbl bbo bbr be- bea beb bee bef bek bel beo ber bfa bfb bfe bff bfl bfo bfr bka bkb bke bkf bkk bkl bko bkr bla blb ble blf blk bll blo blr boa bob boe bof bok bol boo bor bra brb bre brf brk brl bro brr eaa eab eae eaf eak eal eao ear eba ebb ebe ebf ebk ebl ebo ebr eea eeb eee eef eek eel eeo eer ef- efa efb efe eff efl efo efr eka ekb eke ekf ekl eko ekr ela elb ele elf elk ell elo elr eo- eoa eob eoe eof eok eol eoo eor era erb ere erf erk erl ero err faa fab fae faf fak fal fao far fba fbb fbe fbf fbk fbl fbo fbr fea feb fee fef fek fel feo fer ffa ffe fff ffk ffl ffo ffr fka fkb fkf fkk fkl fla flb fle flf fll flo flr foa fob foe fof fok fol foo for fra frb fre frf frk frl fro frr ka- kaa kab kae kaf kak kal kao kar kba kbb kbe kbf kbk kbl kbo kbr ke- kea keb kee kef kek kel keo ker kfa kff kfo kkb kke kkk kkl kkr kl- kla klb klf klo klr koa kob koe kof kok kol koo kor kra krf krk krl kro krr la- laa lab lae laf lak lal lao lar lba lbb lbe lbf lbk lbl lbo lbr lea leb lee lef lek lel leo ler lfa lfb lfe lff lfk lfl lfo lfr lka lkb lkl lkr lla llb lle llf llk lll llo llr loa lob loe lof lok lol loo lor lra lrb lrf lrk lro lrr oaa oab oae oaf oak oal oao oar ob- oba obb obe obf obk obl obo obr oea oeb oee oef oel oeo oer of- ofa ofb ofe off ofl ofo ofr oka okb oke okk okl oko okr ola olb ole olf olk oll olo oo- ooa oob oof ook ool ooo oor or- ora orb ore orf ork orl oro orr ra- raa rab rae raf rak ral rao rar rba rbb rbe rbf rbk rbl rbo rbr re- rea reb ree ref rek rel reo rer rfa rfb rfe rff rfk rfl rfo rfr rkb rke rkf rkk rko rla rle rlf rll rlo rlr roa rob roe rof rok rol roo ror rra rrb rrf rrk rrl rrr