c-- ccc cco ccp ccs co- coc coo cop cos coy cpc cpo cpp cps csc cso csp css csy cyc cyo cyp cys oc- occ oco ocp ocs oo- ooc ooo oop oos op- opc opo opp ops opy os- osc oso osp oss oyo oys p-p pcc pco pcp pcs poc poo pop pos poy ppc ppo ppp pps ps- psc pso psp pss psy py- pyc pyo pys scc sco scp scs soc soo sop sos soy spc spo spp sps spy ss- ssc sso ssp sss sy- syc syp sys ycc yco ycp ycs ycy yoc yoo yop yos yoy ypo yps ysc yso ysp yss ysy yyc yys yyy