c-- ccc cco ccp ccr ccs co- coc coo cop cor cos coy cpc cpo cpp cpr cps crc cro crp crr crs cry csc cso csp csr css csy cyc cyo cyp cyr cys oc- occ oco ocp ocr ocs oo- ooc ooo oop oor oos op- opc opo opp opr ops opy or- orc oro orp orr ors ory os- osc oso osp osr oss oyo oys p-p pcc pco pcp pcr pcs poc poo pop por pos poy ppc ppo ppp ppr pps prc pro prp prr prs pry ps- psc pso psp psr pss psy py- pyc pyo pyr pys rcc rco rcp rcr rcs roc roo rop ror ros roy rpc rpo rpp rpr rps rrc rrp rrr rrs rsc rso rsp rsr rss ry- ryc ryo ryr rys ryy scc sco scp scr scs soc soo sop sor sos soy spc spo spp spr sps spy sr- src sro srp srr srs sry ss- ssc sso ssp ssr sss sy- syc syp syr sys ycc yco ycp ycs ycy yoc yoo yop yor yos yoy ypo yps yrc yro yrp yrs ysc yso ysp ysr yss ysy yyc yys yyy