-al a-a a-b aaa aab aag aal aan aar ab- aba abb abg abl abn abr ag- aga agb agg agl agn agr al- ala alb alg all aln alr an- ana anb ang anl ann anr ar- ara arb arg arl arn arr baa bab bag bal ban bar bba bbb bbg bbl bbn bbr bga bgb bgg bgl bgn bgr bla blb blg bll bln blr bna bnb bng bnl bnn bnr bra brb brg brl brn brr gaa gab gag gal gan gar gba gbg gbl gbn gbr gga ggb ggg ggn ggr gla glb glg gll gln glr gna gnb gnl gnn gnr gra grb grg grl grn grr la- laa lab lag lal lan lar lba lbb lbg lbl lbr lga lgb lgg lgl lgn lgr lla llb llg lll lln llr lna lnb lng lnl lnn lnr lra lrb lrg lrn lrr naa nab nag nal nan nar nba nbb nbg nbl nbn nbr nga ngb ngg ngl ngn nla nlb nlg nll nln nlr nna nnb nng nnl nnn nra nrb nrg nrl nrn nrr ra- raa rab rag ral ran rar rba rbb rbg rbl rbn rbr rga rgb rgg rgn rgr rla rlg rll rln rlr rna rnb rng rnn rnr rra rrb rrg rrl rrn rrr