c-- ccc ccd ccf cco ccr ccs ccu cdc cdd cdf cdo cdr cds cdu cfc cfd cff cfo cfr cfs cfu co- coc cod cof coo cor cos cou crc crd crf cro crr crs cru csc csd csf cso csr css csu cuc cud cuf cuo cur cus cuu dcc dcd dcf dco dcr dcs dcu ddc ddd ddf ddo ddr dds ddu dfc dfd dff dfo dfr dfs dfu doc dod dof doo dor dos dou drc drd dro drr drs dru dsc dsd dsf dso dsr dss dsu duc dud duf duo dur dus fcc fcd fcf fco fcr fcs fcu fdc fdd fdf fdo fdr fds fdu ffc ffd fff ffo ffr ffs ffu foc fof foo for fos fou frc frd frf fro frr frs fru fsc fsd fsf fso fsr fss fsu fud fuf fuo fur fus fuu oc- occ ocd ocf oco ocr ocs ocu odc odd odf odo odr ods odu of- ofc ofd off ofo ofr ofs ofu oo- ooc ood oof ooo oor oos or- orc ord orf oro orr ors oru os- osc osd osf oso osr oss osu ou- ouc oud ouf ouo our ous rcc rcd rcf rco rcr rcs rcu rdc rdd rdf rdo rdr rds rdu rfc rfd rff rfo rfr rfs rfu roc rod rof roo ror ros rou rrc rrd rrf rrr rrs rru rsc rsd rsf rso rsr rss rsu ruc rud ruf ruo rur rus ruu scc scd scf sco scr scs scu sdc sdd sdf sdo sdr sds sdu sfc sfd sff sfo sfr sfs sfu soc sod sof soo sor sos sou sr- src srd srf sro srr srs ss- ssc ssd ssf sso ssr sss ssu suc sud suf suo sur sus suu ucc ucd ucf uco ucr ucs ucu udc udd udf udo udr uds udu ufc ufd uff ufo ufr ufs ufu uoc uod uoo uor uos ur- urc urd urf uro urr urs uru usc usd usf uso usr uss usu uuc uur uus uuu