cccc cccl cccp cclc ccoc ccpl ccpp ccpr ccrc ccrl ccrp cloo clop clor clpp clro coco cocp col- coll colo colp cool coop copo copp copr cor- corc corl coro corp corr cplc crcc crcr croc crol croo crop cror crpc lccc lcor lcpc lcpl lcrl llcc lllc llll lloc lloo locc loco loll lolo looc lool loop loor lopp loro lppl lprp lroc lrrc lrrr occc oclc ocpp ocrl ocro ocrr olcc ollo olor olpc oocr oolo oooo opo- opor oppo orco orlo oro- oror orpc orro pccc pccl pcll pclo pcpp pcrc pcrl plcc ploc ploo plop plpp poco poll polo pool poop poor pop- popc popo popp porc poro porr ppcc pplo pppo pppp pprc prcc prcp prlr pro- proc prol proo prop rccc rcpo rocc roco roll rolo rolp rool roop roor ropo rorc roro rrrr