-er -ic c-- ccc ccd cce cci cck ccr ccs ccu cdc cdd cde cdi cdk cdr cds cdu ce- cec ced cee cei cek cer ces ceu ci- cic cid cie cii cik cir cis ciu ckc ckd cki cks crc crd cre cri crk crr crs cru csc csd cse csi csk csr css csu cuc cud cue cui cuk cur cus cuu dcc dcd dce dci dck dcr dcs dcu ddc ddd dde ddi ddk ddr dds ddu de- dec ded dee dei dek der des deu di- dic did die dii dik dir dis diu dkc dke dki dkk dkr dks dku drc drd dre dri drk drr drs dru dsc dsd dse dsi dsk dsr dss dsu duc dud due dui duk dur dus ec- ecc ecd ece eci eck ecr ecs ecu ed- edc edd ede edi edk edr eds edu eec eed eee eek eer ees eic eid eie eii eik eir eis eiu ekc ekd eke eki ekr eks eku erc erd ere eri erk err ers eru es- esc esd ese esi esk esr ess esu eu- euc eud eue eui eur eus i-d icc icd ice ici ick icr ics icu idc idd ide idi idk idr ids idu ie- iec ied iee iei iek ier ies iic iid iie iii iir iis iiu ikc ike iki ikk ikr iks iku ir- irc ird ire iri irk irr irs iru is- isc isd ise isi isk isr iss isu iu- iuc iud iue iui iur ius kcc kcd kce kci kck kcr kcs kcu kdc kde kdk kdr kds kdu ke- kec ked kee kei kek ker kes kic kid kie kii kik kir kis kiu kkc kke kki kkk kkr kks kku krc krd kri krk krr krs kru ksc ksd kse ksi ksk ksr kss ksu kuc kud kue kui kuk kur kus kuu rcc rcd rce rci rcr rcs rcu rdc rdd rde rdi rdr rds rdu re- rec red ree rei rek rer res reu ric rid rie rii rik rir ris rkc rke rkk rks rku rrc rrd rri rrk rrr rrs rru rsc rsd rse rsi rsk rsr rss rsu ruc rud rue rui ruk rur rus ruu scc scd sce sci sck scr scs scu sdc sdd sde sdi sdk sdr sds sdu se- sec sed see sei sek ser ses seu sic sid sie sii sik sir sis siu sk- skc skd ske ski skk skr sks sku sr- src srd sre sri srk srr srs ss- ssc ssd sse ssi ssk ssr sss ssu suc sud sue sui suk sur sus suu ucc ucd uce uci uck ucr ucs ucu udc udd ude udi udk udr uds udu uec ued uee uei uer ues uic uid uie uii uir uis uiu ukc uke uki ukk ukr uku ur- urc urd ure uri urk urr urs uru usc usd use usi usk usr uss usu uuc uue uur uus uuu