c-- ccc cco ccr ccs ccu co- coc coo cor cos cou crc cro crr crs cru csc cso csr css csu cuc cuo cur cus cuu oc- occ oco ocr ocs ocu oo- ooc ooo oor oos or- orc oro orr ors oru os- osc oso osr oss osu ou- ouc ouo our ous rcc rco rcr rcs rcu roc roo ror ros rou rrc rrr rrs rru rsc rso rsr rss rsu ruc ruo rur rus ruu scc sco scr scs scu soc soo sor sos sou sr- src sro srr srs ss- ssc sso ssr sss ssu suc suo sur sus suu ucc uco ucr ucs ucu uoc uoo uor uos ur- urc uro urr urs uru usc uso usr uss usu uuc uur uus uuu