-al -er -ol a-a a-b a-i aaa aab aae aai aak aal aao aar ab- aba abb abe abi abk abl abo abr aea aeb aee aei aek ael aeo aer ai- aia aib aie aii aik ail aio air aka akb ake aki akk akl ako akr al- ala alb ale ali alk all alo alr aoa aob aoe aoi aok aol aoo aor ar- ara arb are ari ark arl aro arr baa bab bae bai bak bal bao bar bba bbb bbe bbi bbk bbl bbo bbr be- bea beb bee bei bek bel beo ber bi- bia bib bie bii bik bil bio bir bka bkb bke bkk bkl bko bkr bla blb ble bli blk bll blo blr boa bob boe boi bok bol boo bor bra brb bre bri brk brl bro brr eaa eab eae eai eak eal eao ear eba ebb ebe ebi ebk ebl ebo ebr eea eeb eee eek eel eeo eer eia eib eie eii eik eil eio eir eka ekb eke eki ekl eko ekr ela elb ele eli elk ell elo elr eo- eoa eob eoe eoi eok eol eoo eor era erb ere eri erk erl ero err ia- iaa iab iae iai ial iao iar iba ibb ibe ibi ibk ibl ibo ibr ie- iea iee iei iek iel ier iia iib iie iii iil iio iir ika ikb ike iki ikk ikl iko ikr il- ila ilb ile ili ilk ill ilo ilr io- ioa iob ioe ioi iol ioo ior ir- ira irb ire iri irk irl iro irr ka- kaa kab kae kai kak kal kao kar kba kbb kbe kbi kbk kbl kbo kbr ke- kea keb kee kei kek kel keo ker kia kib kie kii kik kil kio kir kkb kke kki kkk kkl kkr kl- kla klb kli klo klr koa kob koe koi kok kol koo kor kra kri krk krl kro krr la- laa lab lae lai lak lal lao lar lba lbb lbe lbi lbk lbl lbo lbr lea leb lee lei lek lel leo ler lia lib lie lii lik lil lio lir lka lkb lkl lkr lla llb lle lli llk lll llo llr loa lob loe loi lok lol loo lor lra lrb lri lrk lro lrr o-i oaa oab oae oai oak oal oao oar ob- oba obb obe obi obk obl obo obr oea oeb oee oei oel oeo oer oia oib oie oii oik oil oio oir oka okb oke oki okk okl oko okr ola olb ole oli olk oll olo oo- ooa oob ooi ook ool ooo oor or- ora orb ore ori ork orl oro orr ra- raa rab rae rai rak ral rao rar rba rbb rbe rbi rbk rbl rbo rbr re- rea reb ree rei rek rel reo rer ria rib rie rii rik ril rio rir rkb rke rkk rko rla rle rli rll rlo rlr roa rob roe roi rok rol roo ror rra rrb rri rrk rrl rrr