c-- ccc ccd cck cco ccs cct ccu cdc cdd cdk cdo cds cdt cdu ckc ckd cko cks ckt co- coc cod cok coo cos cot cou csc csd csk cso css cst csu ctc ctd ctk cto cts ctt ctu cuc cud cuk cuo cus cut cuu dcc dcd dck dco dcs dct dcu ddc ddd ddk ddo dds ddt ddu dkc dkk dko dks dkt dku doc dod dok doo dos dot dou dsc dsd dsk dso dss dst dsu dtc dtd dtk dto dts dtt dtu duc dud duk duo dus dut k-t kcc kcd kck kcs kct kcu kdc kdk kdo kds kdt kdu kkc kkk kks kkt kku koc kod kok koo kos kot kou ksc ksd ksk kso kss kst ksu ktc ktk kto kts ktt ktu kuc kud kuk kus kut kuu oc- occ ocd ock oco ocs oct ocu odc odd odo ods odt odu okc okd okk oko oks oku oo- ooc ood ook ooo oos oot os- osc osd osk oso oss ost osu ot- otc otd otk oto ots ott otu ou- ouc oud ouk ouo ous out scc scd sck sco scs sct scu sdc sdd sdk sdo sds sdt sdu sk- skc skd skk sko sks skt sku soc sod sok soo sos sot sou ss- ssc ssd ssk sso sss sst ssu stc std stk sto sts stt stu suc sud suk suo sus sut suu tcc tcd tck tco tcs tct tcu tdc tdd tdk tdo tds tdt tdu tkc tkk tko tks tkt to- toc tod tok too tos tot tou tsc tsd tsk tso tss tst tsu ttc ttd ttk tto tts ttt ttu tuc tud tuk tuo tus tut tuu ucc ucd uck uco ucs uct ucu udc udd udk udo uds udt udu ukc ukk uku uoc uod uok uoo uos uot usc usd usk uso uss ust usu utc utd utk uto uts utt utu uuc uus uut uuu