-al -er -ol a-a a-b aaa aab aae aak aal aao aar ab- aba abb abe abk abl abo abr aea aeb aee aek ael aeo aer aka akb ake akk akl ako akr al- ala alb ale alk all alo alr aoa aob aoe aok aol aoo aor ar- ara arb are ark arl aro arr baa bab bae bak bal bao bar bba bbb bbe bbk bbl bbo bbr be- bea beb bee bek bel beo ber bka bkb bke bkk bkl bko bkr bla blb ble blk bll blo blr boa bob boe bok bol boo bor bra brb bre brk brl bro brr eaa eab eae eak eal eao ear eba ebb ebe ebk ebl ebo ebr eea eeb eee eek eel eeo eer eka ekb eke ekl eko ekr ela elb ele elk ell elo elr eo- eoa eob eoe eok eol eoo eor era erb ere erk erl ero err ka- kaa kab kae kak kal kao kar kba kbb kbe kbk kbl kbo kbr ke- kea keb kee kek kel keo ker kkb kke kkk kkl kkr kl- kla klb klo klr koa kob koe kok kol koo kor kra krk krl kro krr la- laa lab lae lak lal lao lar lba lbb lbe lbk lbl lbo lbr lea leb lee lek lel leo ler lka lkb lkl lkr lla llb lle llk lll llo llr loa lob loe lok lol loo lor lra lrb lrk lro lrr oaa oab oae oak oal oao oar ob- oba obb obe obk obl obo obr oea oeb oee oel oeo oer oka okb oke okk okl oko okr ola olb ole olk oll olo oo- ooa oob ook ool ooo oor or- ora orb ore ork orl oro orr ra- raa rab rae rak ral rao rar rba rbb rbe rbk rbl rbo rbr re- rea reb ree rek rel reo rer rkb rke rkk rko rla rle rll rlo rlr roa rob roe rok rol roo ror rra rrb rrk rrl rrr