cccc cccl cccp cclc ccoc ccpl ccpp ckck ckcl ckco ckoc ckoo ckpc clok cloo clop clpp cock coco cocp cok- coko col- colk coll colo colp cook cool coop copo copp cplc k-lo kccc kcck kccl kckc kckk kckl kcko kclc kclk kcll kcol kcpc kcpl kcpo kkck kkcl kkco kkkk kklc kkll kklo kkol kkoo kkpc kkpk kkpl klcc klck klcl klkc klkk klkl klko kllc kllk kllp kloc klok klol kloo klop klpc kock kocp kokc kokk koko kokp kolc kolk koll kolo kooc kook kool kooo koop kopp kpcc kpcl kpkk kpkl kplc kplk kplo kpoc kpok kpol kpoo kpop kppc kppk kppl kppo kppp lccc lcpc lcpl llcc lllc llll lloc lloo locc lock loco lokk loko loll lolo looc look lool loop lopp lppl occc oclc ocpp okko oklo okok okol okpo olcc ollo olpc oolo oooo opo- oppo pccc pccl pclk pcll pclo pcpp plcc plkk ploc plok ploo plop plpp pock poco poko polk poll polo pook pool poop pop- popc popo popp ppcc pplo pppo pppp