-er -ic c-- ccc ccd cce cci ccr ccs ccu cdc cdd cde cdi cdr cds cdu ce- cec ced cee cei cer ces ceu ci- cic cid cie cii cir cis ciu crc crd cre cri crr crs cru csc csd cse csi csr css csu cuc cud cue cui cur cus cuu dcc dcd dce dci dcr dcs dcu ddc ddd dde ddi ddr dds ddu de- dec ded dee dei der des deu di- dic did die dii dir dis diu drc drd dre dri drr drs dru dsc dsd dse dsi dsr dss dsu duc dud due dui dur dus ec- ecc ecd ece eci ecr ecs ecu ed- edc edd ede edi edr eds edu eec eed eee eer ees eic eid eie eii eir eis eiu erc erd ere eri err ers eru es- esc esd ese esi esr ess esu eu- euc eud eue eui eur eus i-d icc icd ice ici icr ics icu idc idd ide idi idr ids idu ie- iec ied iee iei ier ies iic iid iie iii iir iis iiu ir- irc ird ire iri irr irs iru is- isc isd ise isi isr iss isu iu- iuc iud iue iui iur ius rcc rcd rce rci rcr rcs rcu rdc rdd rde rdi rdr rds rdu re- rec red ree rei rer res reu ric rid rie rii rir ris rrc rrd rri rrr rrs rru rsc rsd rse rsi rsr rss rsu ruc rud rue rui rur rus ruu scc scd sce sci scr scs scu sdc sdd sde sdi sdr sds sdu se- sec sed see sei ser ses seu sic sid sie sii sir sis siu sr- src srd sre sri srr srs ss- ssc ssd sse ssi ssr sss ssu suc sud sue sui sur sus suu ucc ucd uce uci ucr ucs ucu udc udd ude udi udr uds udu uec ued uee uei uer ues uic uid uie uii uir uis uiu ur- urc urd ure uri urr urs uru usc usd use usi usr uss usu uuc uue uur uus uuu