a-a a-c a-z aaa aac aao aar aas aaz ac- aca acc aco acr acs acz aoa aoc aoo aor aos ar- ara arc aro arr ars arz as- asa asc aso asr ass asz az- aza azo azs azz c-- caa cac cao car cas caz cca ccc cco ccr ccs ccz co- coa coc coo cor cos coz cra crc cro crr crs crz csa csc cso csr css csz cz- czc czo oaa oac oao oar oas oc- oca occ oco ocr ocs ocz oo- ooa ooc ooo oor oos or- ora orc oro orr ors orz os- osa osc oso osr oss oza ozo ozs ozz ra- raa rac rao rar ras raz rca rcc rco rcr rcs roa roc roo ror ros roz rra rrc rrr rrs rsa rsc rso rsr rss rza rzo saa sac sao sar sas saz sca scc sco scr scs soa soc soo sor sos soz sr- sra src sro srr srs ss- ssa ssc sso ssr sss ssz sza szr zaa zac zao zar zas zaz zco zcs zo- zoa zoc zoo zor zos zro zrs zsa zsz zzr zzs zzz