c-- ccc cck ccr ccs ccz ckc cks cky crc crk crr crs cry crz csc csk csr css csy csz cyc cyk cyr cys cz- czc czk k-z kcc kck kcr kcs kkc kkk kkr kks kky krc krk krr krs kry ksc ksk ksr kss kyc kyr kys kyz kzy rcc rcr rcs rkc rkk rks rky rkz rrc rrk rrr rrs rsc rsk rsr rss ry- ryc ryk ryr rys ryy ryz rzy scc sck scr scs sk- skc skk skr sks sky sr- src srk srr srs sry ss- ssc ssk ssr sss ssz sy- syc syk syr sys szr ycc ycs ycy ykk yrc yrs ysc ysk ysr yss ysy ysz yyc yys yyy yyz yzr yzy zcs zks zrs zsz zzr zzs zzy zzz