c-- ccc ccd cco ccr ccs cct ccu cdc cdd cdo cdr cds cdt cdu co- coc cod coo cor cos cot cou crc crd cro crr crs crt cru csc csd cso csr css cst csu ctc ctd cto ctr cts ctt ctu cuc cud cuo cur cus cut cuu dcc dcd dco dcr dcs dct dcu ddc ddd ddo ddr dds ddt ddu doc dod doo dor dos dot dou drc drd dro drr drs drt dru dsc dsd dso dsr dss dst dsu dtc dtd dto dtr dts dtt dtu duc dud duo dur dus dut oc- occ ocd oco ocr ocs oct ocu odc odd odo odr ods odt odu oo- ooc ood ooo oor oos oot or- orc ord oro orr ors ort oru os- osc osd oso osr oss ost osu ot- otc otd oto otr ots ott otu ou- ouc oud ouo our ous out rcc rcd rco rcr rcs rct rcu rdc rdd rdo rdr rds rdt rdu roc rod roo ror ros rot rou rrc rrd rrr rrs rrt rru rsc rsd rso rsr rss rst rsu rtc rtd rto rtr rts rtt rtu ruc rud ruo rur rus rut ruu scc scd sco scr scs sct scu sdc sdd sdo sdr sds sdt sdu soc sod soo sor sos sot sou sr- src srd sro srr srs srt ss- ssc ssd sso ssr sss sst ssu stc std sto str sts stt stu suc sud suo sur sus sut suu tcc tcd tco tcr tcs tct tcu tdc tdd tdo tdr tds tdt tdu to- toc tod too tor tos tot tou trc trd tro trr trs trt tru tsc tsd tso tsr tss tst tsu ttc ttd tto ttr tts ttt ttu tuc tud tuo tur tus tut tuu ucc ucd uco ucr ucs uct ucu udc udd udo udr uds udt udu uoc uod uoo uor uos uot ur- urc urd uro urr urs urt uru usc usd uso usr uss ust usu utc utd uto utr uts utt utu uuc uur uus uut uuu