-al -ol a-a a-b aaa aab aal aan aao aar ab- aba abb abl abn abo abr al- ala alb all aln alo alr an- ana anb anl ann ano anr aoa aob aol aon aoo aor ar- ara arb arl arn aro arr baa bab bal ban bao bar bba bbb bbl bbn bbo bbr bla blb bll bln blo blr bna bnb bnl bnn bno bnr boa bob bol bon boo bor bra brb brl brn bro brr la- laa lab lal lan lao lar lba lbb lbl lbo lbr lla llb lll lln llo llr lna lnb lnl lnn lno lnr loa lob lol lon loo lor lra lrb lrn lro lrr naa nab nal nan nao nar nba nbb nbl nbn nbo nbr nla nlb nll nln nlo nlr nna nnb nnl nnn nno no- noa nob nol non noo nor nra nrb nrl nrn nro nrr oaa oab oal oan oao oar ob- oba obb obl obn obo obr ola olb oll oln olo on- ona onb onl onn ono onr oo- ooa oob ool oon ooo oor or- ora orb orl orn oro orr ra- raa rab ral ran rao rar rba rbb rbl rbn rbo rbr rla rll rln rlo rlr rna rnb rnn rno rnr roa rob rol ron roo ror rra rrb rrl rrn rrr