a-a a-c a-z aaa aac aad aar aaz ac- aca acc acd acr acz ad- ada adc add adr adz ar- ara arc ard arr arz az- aza azd azz c-- caa cac cad car caz cca ccc ccd ccr ccz cda cdc cdd cdr cdz cra crc crd crr crz cz- czc czd daa dac dad dar daz dca dcc dcd dcr dda ddc ddd ddr ddz dra drc drd drr drz dza dzd dzr ra- raa rac rad rar raz rca rcc rcd rcr rda rdc rdd rdr rra rrc rrd rrr rza zaa zac zad zar zaz zzr zzz