a-a a-c a-z aaa aac aar aas aaz ac- aca acc acr acs acz ar- ara arc arr ars arz as- asa asc asr ass asz az- aza azs azz c-- caa cac car cas caz cca ccc ccr ccs ccz cra crc crr crs crz csa csc csr css csz cz- czc ra- raa rac rar ras raz rca rcc rcr rcs rra rrc rrr rrs rsa rsc rsr rss rza saa sac sar sas saz sca scc scr scs sr- sra src srr srs ss- ssa ssc ssr sss ssz sza szr zaa zac zar zas zaz zcs zrs zsa zsz zzr zzs zzz