-al -er -ol a-a a-b aaa aab aae aak aal aao aar aau ab- aba abb abe abk abl abo abr abu aea aeb aee aek ael aeo aer aeu aka akb ake akk akl ako akr aku al- ala alb ale alk all alo alr alu aoa aob aoe aok aol aoo aor aou ar- ara arb are ark arl aro arr aru au- aua aub aue auk aul auo aur b-u baa bab bae bak bal bao bar bau bba bbb bbe bbk bbl bbo bbr bbu be- bea beb bee bek bel beo ber beu bka bkb bke bkk bkl bko bkr bla blb ble blk bll blo blr blu boa bob boe bok bol boo bor bou bra brb bre brk brl bro brr bru bua bub bue buk bul buo bur buu eaa eab eae eak eal eao ear eau eba ebb ebe ebk ebl ebo ebr ebu eea eeb eee eek eel eeo eer eka ekb eke ekl eko ekr eku ela elb ele elk ell elo elr elu eo- eoa eob eoe eok eol eoo eor eou era erb ere erk erl ero err eru eu- eua eub eue eul eur ka- kaa kab kae kak kal kao kar kau kba kbb kbe kbk kbl kbo kbr kbu ke- kea keb kee kek kel keo ker kkb kke kkk kkl kkr kku kl- kla klb klo klr klu koa kob koe kok kol koo kor kou kra krk krl kro krr kru kub kue kuk kul kur kuu la- laa lab lae lak lal lao lar lau lba lbb lbe lbk lbl lbo lbr lbu lea leb lee lek lel leo ler leu lka lkb lkl lkr lla llb lle llk lll llo llr llu loa lob loe lok lol loo lor lou lra lrb lrk lro lrr lru lua lub lue luk lul luo lur luu oaa oab oae oak oal oao oar oau ob- oba obb obe obk obl obo obr obu oea oeb oee oel oeo oer oka okb oke okk okl oko okr oku ola olb ole olk oll olo olu oo- ooa oob ook ool ooo oor or- ora orb ore ork orl oro orr oru ou- oua oue ouk oul ouo our ra- raa rab rae rak ral rao rar rau rba rbb rbe rbk rbl rbo rbr rbu re- rea reb ree rek rel reo rer reu rkb rke rkk rko rku rla rle rll rlo rlr rlu roa rob roe rok rol roo ror rou rra rrb rrk rrl rrr rru rua rub rue ruk ruo rur ruu ua- uaa uab uae uak ual uao uar uau uba ubb ube ubk ubl ubo ubr ubu uea ueb uee uel uer uka ukb uke ukk ukl ukr uku ula ulb ule ulk ull ulo ulr ulu uoa uob uoe uok uol uoo uor ur- ura urb ure urk url uro urr uru uua uue uur uuu