cccc cccs cccv ccoc ccrc ccrs ccss ccvo ccvs coco coos cor- corc coro corr cors cosc coso coss covo crcc crcr croc croo cror crss cscc csco cscr cscs csor csos csrc csrs cssr cvcc cvrr cvss occc ocos ocro ocrr ocrs oocr oooo ooos orco orcs oro- oror oros orro orrs orso orvr orvs oscc osco osoo osor osos osov osro osso ovcs ovo- ovoo rccc rccs rcos rcsc rcss rcvr rcvs rocc roco rocs roor roos rorc roro rosc roso ross rovo rovs rrrr rscc rscs rsos rv-c s-os sccc sccs scoo scor scr- scrc scrs scsc scso scsr soco socr socs soor soos soro sorr sors soso soss sosv sovo sovs srcc sros sscc sscs ssoc ssrc ssrs sssc ssss svcc svcs svor svsc vcrs vooc voor vor- voro vors voso voss vroc vssc vvvv