-er c-- ccc ccd cce cco ccr ccs cct ccu cdc cdd cde cdo cdr cds cdt cdu ce- cec ced cee ceo cer ces cet ceu co- coc cod coe coo cor cos cot cou crc crd cre cro crr crs crt cru csc csd cse cso csr css cst csu ctc ctd cte cto ctr cts ctt ctu cuc cud cue cuo cur cus cut cuu dcc dcd dce dco dcr dcs dct dcu ddc ddd dde ddo ddr dds ddt ddu de- dec ded dee deo der des det deu doc dod doe doo dor dos dot dou drc drd dre dro drr drs drt dru dsc dsd dse dso dsr dss dst dsu dtc dtd dte dto dtr dts dtt dtu duc dud due duo dur dus dut ec- ecc ecd ece eco ecr ecs ect ecu ed- edc edd ede edo edr eds edt edu eec eed eee eeo eer ees eet eo- eoc eod eoe eoo eor eos eot eou erc erd ere ero err ers ert eru es- esc esd ese eso esr ess est esu etc etd ete eto etr ets ett etu eu- euc eud eue eur eus eut oc- occ ocd oco ocr ocs oct ocu odc odd ode odo odr ods odt odu oec oed oee oeo oer oes oet oo- ooc ood ooo oor oos oot or- orc ord ore oro orr ors ort oru os- osc osd ose oso osr oss ost osu ot- otc otd ote oto otr ots ott otu ou- ouc oud oue ouo our ous out rcc rcd rce rco rcr rcs rct rcu rdc rdd rde rdo rdr rds rdt rdu re- rec red ree reo rer res ret reu roc rod roe roo ror ros rot rou rrc rrd rrr rrs rrt rru rsc rsd rse rso rsr rss rst rsu rtc rtd rte rto rtr rts rtt rtu ruc rud rue ruo rur rus rut ruu scc scd sce sco scr scs sct scu sdc sdd sde sdo sdr sds sdt sdu se- sec sed see seo ser ses set seu soc sod soe soo sor sos sot sou sr- src srd sre sro srr srs srt ss- ssc ssd sse sso ssr sss sst ssu stc std ste sto str sts stt stu suc sud sue suo sur sus sut suu tcc tcd tce tco tcr tcs tct tcu tdc tdd tde tdo tdr tds tdt tdu te- tec ted tee teo ter tes tet teu to- toc tod toe too tor tos tot tou trc trd tre tro trr trs trt tru tsc tsd tse tso tsr tss tst tsu ttc ttd tte tto ttr tts ttt ttu tuc tud tue tuo tur tus tut tuu ucc ucd uce uco ucr ucs uct ucu udc udd ude udo udr uds udt udu uec ued uee uer ues uet uoc uod uoe uoo uor uos uot ur- urc urd ure uro urr urs urt uru usc usd use uso usr uss ust usu utc utd ute uto utr uts utt utu uuc uue uur uus uut uuu