a-a a-b aaa aab aam aap aay ab- aba abb abm abp aby ama amb amm amp amy ap- apa apb apm app apy ay- aya ayp b-p baa bab bam bap bay bba bbb bbm bbp bby bma bmb bmm bmp bpa bpb bpm bpp bpy by- bya bym byp maa mab mam map may mba mbb mbm mbp mma mmb mmm mmp mpa mpb mpm mpp my- mya myb mym p-p paa pab pam pap pay pba pbb pbm pbp pby pma pmb pmm pmp ppa ppb ppm ppp py- pya pyb pym yaa yab yam yap yay ybm ybp yby yma ymm ypa yyb yyy