a-a aaa aaf aag aam aan af- afa aff afg afm afn ag- aga agf agg agm agn ama amf amg amm amn an- ana anf ang anm ann faa faf fag fam fan ffa fff ffg ffm ffn fga fgf fgg fgm fgn fma fmf fmg fmm fmn fna fnf fng fnm fnn gaa gaf gag gam gan gfa gff gfm gga ggg ggm ggn gma gmf gmg gmm gmn gna gnf gnm gnn m-f maa maf mag mam man mfa mff mfg mfm mfn mga mgf mgm mgn mma mmf mmg mmm mmn mna mnf mng mnm mnn naa naf nag nam nan nfa nff nfn nga ngf ngg ngm ngn nma nmg nmm nmn nna nnf nng nnm nnn