c-- ccc cco ccr ccs ccv co- coc coo cor cos cov crc cro crr crs crv csc cso csr css csv cvc cvo cvr cvs cvv oc- occ oco ocr ocs ocv oo- ooc ooo oor oos oov or- orc oro orr ors orv os- osc oso osr oss osv ov- ovc ovo ovs ovv rcc rco rcr rcs rcv roc roo ror ros rov rrc rrr rrs rsc rso rsr rss rsv rvc rvo rvr rvs rvv scc sco scr scs scv soc soo sor sos sov sr- src sro srr srs srv ss- ssc sso ssr sss ssv svc svo svr svs svv vcc vco vcr vcs voc voo vor vos vov vrc vrr vrs vsc vso vsr vss vsv vvc vvo vvr vvs vvv