a-a a-c a-z aaa aac aao aas aay aaz ac- aca acc aco acs acy acz aoa aoc aoo aos as- asa asc aso ass asy asz ay- aya ayc ayo ays ayz az- aza azo azs azy azz c-- caa cac cao cas cay caz cca ccc cco ccs ccz co- coa coc coo cos coy coz csa csc cso css csy csz cya cyc cyo cys cz- czc czo oaa oac oao oas oc- oca occ oco ocs ocz oo- ooa ooc ooo oos os- osa osc oso oss oya oyo oys oza ozo ozs ozz saa sac sao sas say saz sca scc sco scs soa soc soo sos soy soz ss- ssa ssc sso sss ssz sy- sya syc sys sza yaa yac yao yas yay yaz yca ycc yco ycs ycy yoc yoo yos yoy ysa ysc yso yss ysy ysz yyc yys yyy yyz yzy zaa zac zao zas zay zaz zco zcs zo- zoa zoc zoo zos zsa zsz zzs zzy zzz