c-- ccc ccd ccf cck cco ccr ccs ccu cdc cdd cdf cdk cdo cdr cds cdu cfc cfd cff cfk cfo cfr cfs cfu ckc ckd cko cks co- coc cod cof cok coo cor cos cou crc crd crf crk cro crr crs cru csc csd csf csk cso csr css csu cuc cud cuf cuk cuo cur cus cuu dcc dcd dcf dck dco dcr dcs dcu ddc ddd ddf ddk ddo ddr dds ddu dfc dfd dff dfk dfo dfr dfs dfu dkc dkk dko dkr dks dku doc dod dof dok doo dor dos dou drc drd drk dro drr drs dru dsc dsd dsf dsk dso dsr dss dsu duc dud duf duk duo dur dus fcc fcd fcf fck fco fcr fcs fcu fdc fdd fdf fdk fdo fdr fds fdu ffc ffd fff ffk ffo ffr ffs ffu fkc fkf fkk foc fof fok foo for fos fou frc frd frf frk fro frr frs fru fsc fsd fsf fsk fso fsr fss fsu fud fuf fuk fuo fur fus fuu kcc kcd kck kcr kcs kcu kdc kdf kdk kdo kdr kds kdu kfc kfd kff kfo kfs kfu kkc kkk kkr kks kku koc kod kof kok koo kor kos kou krc krd krf krk kro krr krs kru ksc ksd ksf ksk kso ksr kss ksu kuc kud kuk kur kus kuu oc- occ ocd ocf ock oco ocr ocs ocu odc odd odf odo odr ods odu of- ofc ofd off ofo ofr ofs ofu okc okd okk oko okr oks oku oo- ooc ood oof ook ooo oor oos or- orc ord orf ork oro orr ors oru os- osc osd osf osk oso osr oss osu ou- ouc oud ouf ouk ouo our ous rcc rcd rcf rco rcr rcs rcu rdc rdd rdf rdo rdr rds rdu rfc rfd rff rfk rfo rfr rfs rfu rkc rkf rkk rko rks rku roc rod rof rok roo ror ros rou rrc rrd rrf rrk rrr rrs rru rsc rsd rsf rsk rso rsr rss rsu ruc rud ruf ruk ruo rur rus ruu scc scd scf sck sco scr scs scu sdc sdd sdf sdk sdo sdr sds sdu sfc sfd sff sfk sfo sfr sfs sfu sk- skc skd skf skk sko skr sks sku soc sod sof sok soo sor sos sou sr- src srd srf srk sro srr srs ss- ssc ssd ssf ssk sso ssr sss ssu suc sud suf suk suo sur sus suu ucc ucd ucf uck uco ucr ucs ucu udc udd udf udk udo udr uds udu ufc ufd uff ufo ufr ufs ufu ukc ukf ukk ukr uku uoc uod uok uoo uor uos ur- urc urd urf urk uro urr urs uru usc usd usf usk uso usr uss usu uuc uur uus uuu