c-- ccc cco ccp ccr co- coc coo cop cor coy cpc cpo cpp cpr crc cro crp crr cry cyc cyo cyp cyr oc- occ oco ocp ocr oo- ooc ooo oop oor op- opc opo opp opr opy or- orc oro orp orr ory oyo p-p pcc pco pcp pcr poc poo pop por poy ppc ppo ppp ppr prc pro prp prr pry py- pyc pyo pyr rcc rco rcp rcr roc roo rop ror roy rpc rpo rpp rpr rrc rrp rrr ry- ryc ryo ryr ryy ycc yco ycp ycy yoc yoo yop yor yoy ypo yrc yro yrp yyc yyy