-er c-- ccc ccd cce cco ccr ccs ccu cdc cdd cde cdo cdr cds cdu ce- cec ced cee ceo cer ces ceu co- coc cod coe coo cor cos cou crc crd cre cro crr crs cru csc csd cse cso csr css csu cuc cud cue cuo cur cus cuu dcc dcd dce dco dcr dcs dcu ddc ddd dde ddo ddr dds ddu de- dec ded dee deo der des deu doc dod doe doo dor dos dou drc drd dre dro drr drs dru dsc dsd dse dso dsr dss dsu duc dud due duo dur dus ec- ecc ecd ece eco ecr ecs ecu ed- edc edd ede edo edr eds edu eec eed eee eeo eer ees eo- eoc eod eoe eoo eor eos eou erc erd ere ero err ers eru es- esc esd ese eso esr ess esu eu- euc eud eue eur eus oc- occ ocd oco ocr ocs ocu odc odd ode odo odr ods odu oec oed oee oeo oer oes oo- ooc ood ooo oor oos or- orc ord ore oro orr ors oru os- osc osd ose oso osr oss osu ou- ouc oud oue ouo our ous rcc rcd rce rco rcr rcs rcu rdc rdd rde rdo rdr rds rdu re- rec red ree reo rer res reu roc rod roe roo ror ros rou rrc rrd rrr rrs rru rsc rsd rse rso rsr rss rsu ruc rud rue ruo rur rus ruu scc scd sce sco scr scs scu sdc sdd sde sdo sdr sds sdu se- sec sed see seo ser ses seu soc sod soe soo sor sos sou sr- src srd sre sro srr srs ss- ssc ssd sse sso ssr sss ssu suc sud sue suo sur sus suu ucc ucd uce uco ucr ucs ucu udc udd ude udo udr uds udu uec ued uee uer ues uoc uod uoe uoo uor uos ur- urc urd ure uro urr urs uru usc usd use uso usr uss usu uuc uue uur uus uuu