-er c-- ccc ccd cce cck ccr ccs ccu cdc cdd cde cdk cdr cds cdu ce- cec ced cee cek cer ces ceu ckc ckd cks crc crd cre crk crr crs cru csc csd cse csk csr css csu cuc cud cue cuk cur cus cuu dcc dcd dce dck dcr dcs dcu ddc ddd dde ddk ddr dds ddu de- dec ded dee dek der des deu dkc dke dkk dkr dks dku drc drd dre drk drr drs dru dsc dsd dse dsk dsr dss dsu duc dud due duk dur dus ec- ecc ecd ece eck ecr ecs ecu ed- edc edd ede edk edr eds edu eec eed eee eek eer ees ekc ekd eke ekr eks eku erc erd ere erk err ers eru es- esc esd ese esk esr ess esu eu- euc eud eue eur eus kcc kcd kce kck kcr kcs kcu kdc kde kdk kdr kds kdu ke- kec ked kee kek ker kes kkc kke kkk kkr kks kku krc krd krk krr krs kru ksc ksd kse ksk ksr kss ksu kuc kud kue kuk kur kus kuu rcc rcd rce rcr rcs rcu rdc rdd rde rdr rds rdu re- rec red ree rek rer res reu rkc rke rkk rks rku rrc rrd rrk rrr rrs rru rsc rsd rse rsk rsr rss rsu ruc rud rue ruk rur rus ruu scc scd sce sck scr scs scu sdc sdd sde sdk sdr sds sdu se- sec sed see sek ser ses seu sk- skc skd ske skk skr sks sku sr- src srd sre srk srr srs ss- ssc ssd sse ssk ssr sss ssu suc sud sue suk sur sus suu ucc ucd uce uck ucr ucs ucu udc udd ude udk udr uds udu uec ued uee uer ues ukc uke ukk ukr uku ur- urc urd ure urk urr urs uru usc usd use usk usr uss usu uuc uue uur uus uuu