-al a-a a-b aaa aab aaf aag aal ab- aba abb abf abg abl af- afa afb aff afg afl ag- aga agb agf agg agl al- ala alb alf alg all baa bab baf bag bal bba bbb bbf bbg bbl bfa bfb bff bfg bfl bga bgb bgf bgg bgl bla blb blf blg bll faa fab faf fag fal fba fbb fbf fbg fbl ffa fff ffg ffl fga fgb fgf fgg fgl fla flb flf flg fll gaa gab gaf gag gal gba gbf gbg gbl gfa gfb gff gfl gga ggb ggg gla glb glf glg gll la- laa lab laf lag lal lba lbb lbf lbg lbl lfa lfb lff lfg lfl lga lgb lgf lgg lgl lla llb llf llg lll