-al a-a a-b aaa aab aag aal aar ab- aba abb abg abl abr ag- aga agb agg agl agr al- ala alb alg all alr ar- ara arb arg arl arr baa bab bag bal bar bba bbb bbg bbl bbr bga bgb bgg bgl bgr bla blb blg bll blr bra brb brg brl brr gaa gab gag gal gar gba gbg gbl gbr gga ggb ggg ggr gla glb glg gll glr gra grb grg grl grr la- laa lab lag lal lar lba lbb lbg lbl lbr lga lgb lgg lgl lgr lla llb llg lll llr lra lrb lrg lrr ra- raa rab rag ral rar rba rbb rbg rbl rbr rga rgb rgg rgr rla rlg rll rlr rra rrb rrg rrl rrr