c-- ccc ccd cco ccs ccu cdc cdd cdo cds cdu co- coc cod coo cos cou csc csd cso css csu cuc cud cuo cus cuu dcc dcd dco dcs dcu ddc ddd ddo dds ddu doc dod doo dos dou dsc dsd dso dss dsu duc dud duo dus oc- occ ocd oco ocs ocu odc odd odo ods odu oo- ooc ood ooo oos os- osc osd oso oss osu ou- ouc oud ouo ous scc scd sco scs scu sdc sdd sdo sds sdu soc sod soo sos sou ss- ssc ssd sso sss ssu suc sud suo sus suu ucc ucd uco ucs ucu udc udd udo uds udu uoc uod uoo uos usc usd uso uss usu uuc uus uuu