a-a a-c a-z aaa aac aam aao aaz ac- aca acc acm aco acz ama amc amm amo amz aoa aoc aom aoo az- aza azm azo azz c-- caa cac cam cao caz cca ccc ccm cco ccz cma cmc cmm cmo co- coa coc com coo coz cz- czc czm czo m-o maa mac mam mao maz mc- mca mcc mcm mco mcz mma mmc mmm mmo mmz moa moc mom moo moz mza mzm oaa oac oam oao oc- oca occ ocm oco ocz om- oma omc omm omo omz oo- ooa ooc oom ooo oza ozm ozo ozz zaa zac zam zao zaz zco zma zmc zmm zo- zoa zoc zom zoo zzz