-al a-a a-b a-t aaa aab aal aan aar aat ab- aba abb abl abn abr abt al- ala alb all aln alr alt an- ana anb anl ann anr ant ar- ara arb arl arn arr art at- ata atb atl atn atr att baa bab bal ban bar bat bba bbb bbl bbn bbr bbt bla blb bll bln blr blt bna bnb bnl bnn bnr bnt bra brb brl brn brr brt bta btb btl btn btr btt la- laa lab lal lan lar lat lba lbb lbl lbr lbt lla llb lll lln llr llt lna lnb lnl lnn lnr lnt lra lrb lrn lrr lrt lta ltb ltl ltr ltt naa nab nal nan nar nat nba nbb nbl nbn nbr nbt nla nlb nll nln nlr nlt nna nnb nnl nnn nnt nra nrb nrl nrn nrr nrt nta ntb ntn ntr ntt ra- raa rab ral ran rar rat rba rbb rbl rbn rbr rbt rla rll rln rlr rlt rna rnb rnn rnr rnt rra rrb rrl rrn rrr rrt rta rtb rtl rtn rtr rtt taa tab tal tan tar tat tba tbb tbl tbn tbr tbt tla tll tln tlr tlt tna tnb tnl tnn tnr tnt tra trb trl trn trr trt tta ttb ttl ttn ttr ttt