-al -ol a-a a-b aaa aab aak aal aan aao aar ab- aba abb abk abl abn abo abr aka akb akk akl akn ako akr al- ala alb alk all aln alo alr an- ana anb ank anl ann ano anr aoa aob aok aol aon aoo aor ar- ara arb ark arl arn aro arr baa bab bak bal ban bao bar bba bbb bbk bbl bbn bbo bbr bka bkb bkk bkl bkn bko bkr bla blb blk bll bln blo blr bna bnb bnk bnl bnn bno bnr boa bob bok bol bon boo bor bra brb brk brl brn bro brr ka- kaa kab kak kal kan kao kar kba kbb kbk kbl kbn kbo kbr kkb kkk kkl kkn kkr kl- kla klb klo klr kn- kna knk knl knn kno knr koa kob kok kol kon koo kor kra krk krl krn kro krr la- laa lab lak lal lan lao lar lba lbb lbk lbl lbo lbr lka lkb lkl lkr lla llb llk lll lln llo llr lna lnb lnk lnl lnn lno lnr loa lob lok lol lon loo lor lra lrb lrk lrn lro lrr naa nab nak nal nan nao nar nba nbb nbk nbl nbn nbo nbr nka nkk nkn nko nkr nla nlb nlk nll nln nlo nlr nna nnb nnk nnl nnn nno no- noa nob nok nol non noo nor nra nrb nrk nrl nrn nro nrr oaa oab oak oal oan oao oar ob- oba obb obk obl obn obo obr oka okb okk okl oko okr ola olb olk oll oln olo on- ona onb onk onl onn ono onr oo- ooa oob ook ool oon ooo oor or- ora orb ork orl orn oro orr ra- raa rab rak ral ran rao rar rba rbb rbk rbl rbn rbo rbr rkb rkk rko rla rll rln rlo rlr rna rnb rnn rno rnr roa rob rok rol ron roo ror rra rrb rrk rrl rrn rrr