c-- ccc cco ccr ccs ccu ccv co- coc coo cor cos cou cov crc cro crr crs cru crv csc cso csr css csu csv cuc cuo cur cus cuu cuv cvc cvo cvr cvs cvu cvv oc- occ oco ocr ocs ocu ocv oo- ooc ooo oor oos oov or- orc oro orr ors oru orv os- osc oso osr oss osu osv ou- ouc ouo our ous ov- ovc ovo ovs ovv rcc rco rcr rcs rcu rcv roc roo ror ros rou rov rrc rrr rrs rru rsc rso rsr rss rsu rsv ruc ruo rur rus ruu ruv rvc rvo rvr rvs rvu rvv scc sco scr scs scu scv soc soo sor sos sou sov sr- src sro srr srs srv ss- ssc sso ssr sss ssu ssv suc suo sur sus suu suv svc svo svr svs svu svv ucc uco ucr ucs ucu ucv uoc uoo uor uos ur- urc uro urr urs uru usc uso usr uss usu usv uuc uur uus uuu uvc uvo uvs uvu uvv vcc vco vcr vcs vcu voc voo vor vos vou vov vrc vrr vrs vru vsc vso vsr vss vsu vsv vur vus vuv vvc vvo vvr vvs vvv