a-a a-c a-z aaa aac aan aao aap aaz ac- aca acc acn aco acp acz an- ana anc ann ano anp anz aoa aoc aon aoo aop ap- apa apc apn apo app az- aza azn azo azp azz c-- caa cac can cao cap caz cca ccc ccn cco ccp ccz cn- cna cnc cnn cno cnp co- coa coc con coo cop coz cpa cpc cpn cpo cpp cpz cz- czc czo naa nac nan nao nap naz nca ncc ncn nco ncp nna nnc nnn nno nnp nnz no- noa noc non noo nop noz npa npc npn npo npp npz nzo nzp nzz oaa oac oan oao oap oc- oca occ ocn oco ocp ocz on- ona onc onn ono onp oo- ooa ooc oon ooo oop op- opa opc opn opo opp oza ozo ozz p-p paa pac pan pao pap paz pca pcc pcn pco pcp pn- pna pnc pnn pno pnp poa poc pon poo pop poz ppa ppc ppn ppo ppp ppz pzc pzp zaa zac zan zao zap zaz zco znc znn zno znp zo- zoa zoc zon zoo zpc zpo zpp zzz