c-- ccc ccd cck cco ccr ccs cct ccu cdc cdd cdk cdo cdr cds cdt cdu ckc ckd cko cks ckt co- coc cod cok coo cor cos cot cou crc crd crk cro crr crs crt cru csc csd csk cso csr css cst csu ctc ctd ctk cto ctr cts ctt ctu cuc cud cuk cuo cur cus cut cuu dcc dcd dck dco dcr dcs dct dcu ddc ddd ddk ddo ddr dds ddt ddu dkc dkk dko dkr dks dkt dku doc dod dok doo dor dos dot dou drc drd drk dro drr drs drt dru dsc dsd dsk dso dsr dss dst dsu dtc dtd dtk dto dtr dts dtt dtu duc dud duk duo dur dus dut k-t kcc kcd kck kcr kcs kct kcu kdc kdk kdo kdr kds kdt kdu kkc kkk kkr kks kkt kku koc kod kok koo kor kos kot kou krc krd krk kro krr krs krt kru ksc ksd ksk kso ksr kss kst ksu ktc ktk kto ktr kts ktt ktu kuc kud kuk kur kus kut kuu oc- occ ocd ock oco ocr ocs oct ocu odc odd odo odr ods odt odu okc okd okk oko okr oks oku oo- ooc ood ook ooo oor oos oot or- orc ord ork oro orr ors ort oru os- osc osd osk oso osr oss ost osu ot- otc otd otk oto otr ots ott otu ou- ouc oud ouk ouo our ous out rcc rcd rco rcr rcs rct rcu rdc rdd rdo rdr rds rdt rdu rkc rkk rko rks rkt rku roc rod rok roo ror ros rot rou rrc rrd rrk rrr rrs rrt rru rsc rsd rsk rso rsr rss rst rsu rtc rtd rtk rto rtr rts rtt rtu ruc rud ruk ruo rur rus rut ruu scc scd sck sco scr scs sct scu sdc sdd sdk sdo sdr sds sdt sdu sk- skc skd skk sko skr sks skt sku soc sod sok soo sor sos sot sou sr- src srd srk sro srr srs srt ss- ssc ssd ssk sso ssr sss sst ssu stc std stk sto str sts stt stu suc sud suk suo sur sus sut suu tcc tcd tck tco tcr tcs tct tcu tdc tdd tdk tdo tdr tds tdt tdu tkc tkk tko tkr tks tkt to- toc tod tok too tor tos tot tou trc trd trk tro trr trs trt tru tsc tsd tsk tso tsr tss tst tsu ttc ttd ttk tto ttr tts ttt ttu tuc tud tuk tuo tur tus tut tuu ucc ucd uck uco ucr ucs uct ucu udc udd udk udo udr uds udt udu ukc ukk ukr uku uoc uod uok uoo uor uos uot ur- urc urd urk uro urr urs urt uru usc usd usk uso usr uss ust usu utc utd utk uto utr uts utt utu uuc uur uus uut uuu