a-a a-c a-z aaa aac aam aao aap aaz ac- aca acc acm aco acp acz ama amc amm amo amp amz aoa aoc aom aoo aop ap- apa apc apm apo app az- aza azm azo azp azz c-- caa cac cam cao cap caz cca ccc ccm cco ccp ccz cma cmc cmm cmo cmp co- coa coc com coo cop coz cpa cpc cpm cpo cpp cpz cz- czc czm czo m-o maa mac mam mao map maz mc- mca mcc mcm mco mcp mcz mma mmc mmm mmo mmp mmz moa moc mom moo mop moz mpa mpc mpm mpo mpp mza mzm mzp oaa oac oam oao oap oc- oca occ ocm oco ocp ocz om- oma omc omm omo omp omz oo- ooa ooc oom ooo oop op- opa opc opm opo opp oza ozm ozo ozz p-p paa pac pam pao pap paz pca pcc pcm pco pcp pma pmc pmm pmo pmp pmz poa poc pom poo pop poz ppa ppc ppm ppo ppp ppz pzc pzm pzp zaa zac zam zao zap zaz zco zma zmc zmm zmp zo- zoa zoc zom zoo zpc zpm zpo zpp zzz