a-a a-c aaa aac aam aao aay ac- aca acc acm aco acy ama amc amm amo amy aoa aoc aom aoo ay- aya ayc ayo c-- caa cac cam cao cay cca ccc ccm cco cma cmc cmm cmo cmy co- coa coc com coo coy cya cyc cym cyo m-o maa mac mam mao may mc- mca mcc mcm mco mma mmc mmm mmo moa moc mom moo moy my- mya myc mym myo oaa oac oam oao oc- oca occ ocm oco om- oma omc omm omo omy oo- ooa ooc oom ooo oya oyo yaa yac yam yao yay yca ycc yco ycy yma ymc ymm ymo yoc yom yoo yoy yyc yyy