a-a a-b aaa aab aag aap aay ab- aba abb abg abp aby ag- aga agb agg agp agy ap- apa apb apg app apy ay- aya ayp b-p baa bab bag bap bay bba bbb bbg bbp bby bga bgb bgg bgp bpa bpb bpg bpp bpy by- bya byg byp g-p gaa gab gag gap gay gba gbg gbp gby gga ggb ggg ggp gpa gpb gpg gpp gy- gya gyb gyp p-p paa pab pag pap pay pba pbb pbg pbp pby pga pgb pgg pgp pgy ppa ppb ppg ppp py- pya pyb pyg yaa yab yag yap yay ybg ybp yby yga ypa ypg yyb yyg yyy