-al a-a a-b aaa aab aag aal aar aas ab- aba abb abg abl abr abs ag- aga agb agg agl agr ags al- ala alb alg all alr als ar- ara arb arg arl arr ars as- asa asb asg asl asr ass baa bab bag bal bar bas bba bbb bbg bbl bbr bbs bga bgb bgg bgl bgr bgs bla blb blg bll blr bls bra brb brg brl brr brs bsa bsb bsg bsl bsr bss gaa gab gag gal gar gas gba gbg gbl gbr gbs gga ggb ggg ggr ggs gla glb glg gll glr gls gra grb grg grl grr grs gsa gsb gsg gsl gsr gss la- laa lab lag lal lar las lba lbb lbg lbl lbr lbs lga lgb lgg lgl lgr lgs lla llb llg lll llr lls lra lrb lrg lrr lrs lsa lsb lsg lsl lsr lss ra- raa rab rag ral rar ras rba rbb rbg rbl rbr rbs rga rgb rgg rgr rgs rla rlg rll rlr rls rra rrb rrg rrl rrr rrs rsa rsb rsg rsl rsr rss saa sab sag sal sar sas sba sbb sbg sbl sbr sbs sga sgb sgg sgl sgr sgs sla slb slg sll slr sls sr- sra srb srg srl srr srs ss- ssa ssb ssg ssl ssr sss