-er c-- ccc cce ccn ccr ccs ccu ce- cec cee cen cer ces ceu cn- cnc cne cnn cnr cns cnu crc cre crn crr crs cru csc cse csn csr css csu cuc cue cun cur cus cuu ec- ecc ece ecn ecr ecs ecu eec eee een eer ees en- enc ene enn enr ens enu erc ere ern err ers eru es- esc ese esn esr ess esu eu- euc eue eun eur eus ncc nce ncn ncr ncs ncu ne- nec nee nen ner nes neu nnc nne nnn nns nnu nrc nre nrn nrr nrs nru nsc nse nsn nsr nss nsu nuc nue nun nur nus nuu rcc rce rcn rcr rcs rcu re- rec ree ren rer res reu rnc rnn rnr rns rnu rrc rrn rrr rrs rru rsc rse rsn rsr rss rsu ruc rue run rur rus ruu scc sce scn scr scs scu se- sec see sen ser ses seu snc sne snn snr sns snu sr- src sre srn srr srs ss- ssc sse ssn ssr sss ssu suc sue sun sur sus suu ucc uce ucn ucr ucs ucu uec uee uen uer ues un- unc une unn unr uns unu ur- urc ure urn urr urs uru usc use usn usr uss usu uuc uue uun uur uus uuu