a-a a-c a-z aaa aac aan aar aaz ac- aca acc acn acr acz an- ana anc ann anr anz ar- ara arc arn arr arz az- aza azn azz c-- caa cac can car caz cca ccc ccn ccr ccz cn- cna cnc cnn cnr cra crc crn crr crz cz- czc naa nac nan nar naz nca ncc ncn ncr nna nnc nnn nnz nra nrc nrn nrr nrz nzz ra- raa rac ran rar raz rca rcc rcn rcr rna rnc rnn rnr rnz rra rrc rrn rrr rza zaa zac zan zar zaz znc znn zzr zzz