c-- ccc cco ccs cct co- coc coo cos cot coy csc cso css cst csy ctc cto cts ctt cty cyc cyo cys cyt oc- occ oco ocs oct oo- ooc ooo oos oot os- osc oso oss ost ot- otc oto ots ott oyo oys scc sco scs sct soc soo sos sot soy ss- ssc sso sss sst stc sto sts stt sty sy- syc sys syt tcc tco tcs tct to- toc too tos tot toy tsc tso tss tst tsy ttc tto tts ttt tty tyc tyo tys tyt ycc yco ycs ycy yoc yoo yos yot yoy ysc yso yss yst ysy ytc yto yts ytt yyc yys yyt yyy