-er c-- ccc cce cck ccn ccr ccs ccu ce- cec cee cek cen cer ces ceu ckc cks cn- cnc cne cnn cnr cns cnu crc cre crk crn crr crs cru csc cse csk csn csr css csu cuc cue cuk cun cur cus cuu ec- ecc ece eck ecn ecr ecs ecu eec eee eek een eer ees ekc eke ekr eks eku en- enc ene enk enn enr ens enu erc ere erk ern err ers eru es- esc ese esk esn esr ess esu eu- euc eue eun eur eus kcc kce kck kcn kcr kcs kcu ke- kec kee kek ken ker kes kkc kke kkk kkn kkr kks kku kn- knc kne knk knn knr knu krc krk krn krr krs kru ksc kse ksk ksn ksr kss ksu kuc kue kuk kun kur kus kuu ncc nce nck ncn ncr ncs ncu ne- nec nee nek nen ner nes neu nkc nke nkk nkn nkr nks nku nnc nne nnk nnn nns nnu nrc nre nrk nrn nrr nrs nru nsc nse nsk nsn nsr nss nsu nuc nue nuk nun nur nus nuu rcc rce rcn rcr rcs rcu re- rec ree rek ren rer res reu rkc rke rkk rks rku rnc rnn rnr rns rnu rrc rrk rrn rrr rrs rru rsc rse rsk rsn rsr rss rsu ruc rue ruk run rur rus ruu scc sce sck scn scr scs scu se- sec see sek sen ser ses seu sk- skc ske skk skr sks sku snc sne snk snn snr sns snu sr- src sre srk srn srr srs ss- ssc sse ssk ssn ssr sss ssu suc sue suk sun sur sus suu ucc uce uck ucn ucr ucs ucu uec uee uen uer ues ukc uke ukk ukn ukr uku un- unc une unk unn unr uns unu ur- urc ure urk urn urr urs uru usc use usk usn usr uss usu uuc uue uun uur uus uuu