a-a a-c a-z aaa aac aak aan aaz ac- aca acc ack acn acz aka akc akk akn an- ana anc ank ann anz az- aza azn azz c-- caa cac cak can caz cca ccc cck ccn ccz cka ckc cn- cna cnc cnn cz- czc czk k-z ka- kaa kac kak kan kaz kca kcc kck kcn kkc kkk kkn kn- kna knc knk knn naa nac nak nan naz nca ncc nck ncn nka nkc nkk nkn nna nnc nnk nnn nnz nzz zaa zac zak zan zaz zka znc znn zzz