c-- ccc cco ccs cct ccz co- coc coo cos cot coy coz csc cso css cst csy csz ctc cto cts ctt cty ctz cyc cyo cys cyt cz- czc czo czt oc- occ oco ocs oct ocz oo- ooc ooo oos oot os- osc oso oss ost ot- otc oto ots ott otz oyo oys ozo ozs ozt ozz scc sco scs sct soc soo sos sot soy soz ss- ssc sso sss sst ssz stc sto sts stt sty stz sy- syc sys syt tcc tco tcs tct to- toc too tos tot toy toz tsc tso tss tst tsy ttc tto tts ttt tty tyc tyo tys tyt tzs ycc yco ycs ycy yoc yoo yos yot yoy ysc yso yss yst ysy ysz ytc yto yts ytt yyc yys yyt yyy yyz yzy zco zcs zo- zoc zoo zos zot zst zsz zzs zzt zzy zzz