cccc cccp ccoc ccpp ccpr ccrc ccrp coco cocp coop copo copp copr copy cor- corc coro corp corr cory coyo coyr crcc crcr croc croo crop cror croy crpc cry- cryo cyc- cycc cypc cyy- cyyc occc ocpp ocro ocrr oocr oooo oory opo- opor oppo oppy opry orco oro- oror oroy orpc orro orry pccc pcpp pcrc poco poop poor pop- popc popo popp popy porc poro porr pory poyo poyr ppcc pppo pppp pprc prcc prcp pro- proc proo prop pyo- pypy pyr- pyro pyry rccc rcpo rcyc rocc roco roop roor ropo ropy rorc roro rory rpyc rrrr yccc yoop yopo yopy yoro yory yoyo ypcc yyyy