cccc cccl cccp cccu cclc ccoc ccpl ccpp ccuc ccup cloo clop clou clpp coco cocp cocu col- coll colo colp colu cool coop copo copp coul coup cpcu cplc cucc culc cull culo culp cupl cupo cupp lccc lcpc lcpl llcc lllc llll lloc lloo locc loco locu loll lolo looc lool loop lopp lopu loul loup louu lppl lull lulu lupo lupu luup occc oclc ocpp ocul olcc ollo olpc oolo oooo opo- oppo oucc oulu ouu- pccc pccl pcll pclo pcpp plcc ploc ploo plop plou plpp plup poco poll polo polu pool poop pop- popc popo popp poul poup ppcc pplo pppo pppp pull pulo pulp pulu pupl pupu puuc uccp ulcc ulco ullo ulo- uloc ulul uocc uolc uplo uppc uppp uppu upup uucp uulu uuoc uuuu