cccc cccp ccoc ccpp ckck ckco ckcy ckoc ckoo ckoy ckpc cock coco cocp cok- coko coky cook coop copo copp copy coyo cyc- cycc cypc cyy- cyyc kccc kcck kccy kckc kckk kcko kcky kcpc kcpo kcyk kcyy kkck kkco kkcy kkkk kkoo kkoy kkpc kkpk kkyc kkyy kock kocp kokc kokk koko kokp koky kooc kook kooo koop kopp kopy koyo koyy kpcc kpkk kpky kpoc kpok kpoo kpop kpoy kppc kppk kppo kppp kpyk kycc kyck kykc kykk kyky kyok kyoo kyoy kyp- kypc kyyk kyyo kyyy occc ocpp okko okok okpo okyo ooky oooo opo- oppo oppy pccc pcpp pock poco poko poky pook poop pop- popc popo popp popy poyo ppcc pppo pppp pyck pykk pyo- pypy yccc ykko yock yoko yoky yook yoop yopo yopy yoyo ypcc yyyy