-er c-- ccc cce cck ccm ccr ccs ccu ce- cec cee cek cem cer ces ceu ckc ckm cks cmc cme cmk cmm cmr cms cmu crc cre crk crm crr crs cru csc cse csk csm csr css csu cuc cue cuk cum cur cus cuu ec- ecc ece eck ecm ecr ecs ecu eec eee eek eem eer ees ekc eke ekr eks eku em- emc eme emk emm emr ems emu erc ere erk erm err ers eru es- esc ese esk esm esr ess esu eu- euc eue eur eus kcc kce kck kcm kcr kcs kcu ke- kec kee kek kem ker kes kkc kke kkk kkm kkr kks kku kmc kme kmk kmm kms kmu krc krk krr krs kru ksc kse ksk ksm ksr kss ksu kuc kue kuk kum kur kus kuu m-r mc- mcc mce mck mcm mcr mcs mcu mec mee mek mem mer mes meu mkc mke mkk mkm mkr mks mku mmc mme mmk mmm mmr mms mmu mrc mre mrk mrm mrr mrs mru msc mse msk msm msr mss msu muc mue muk mum mur mus muu rcc rce rcm rcr rcs rcu re- rec ree rek rem rer res reu rkc rke rkk rkm rks rku rmc rme rmm rmr rms rrc rrk rrm rrr rrs rru rsc rse rsk rsm rsr rss rsu ruc rue ruk rum rur rus ruu scc sce sck scm scr scs scu se- sec see sek sem ser ses seu sk- skc ske skk skm skr sks sku smc sme smk smm smr sms smu sr- src sre srk srm srr srs ss- ssc sse ssk ssm ssr sss ssu suc sue suk sum sur sus suu ucc uce uck ucm ucr ucs ucu uec uee uem uer ues ukc uke ukk ukr uku um- umc ume umm umr ums umu ur- urc ure urk urm urr urs uru usc use usk usm usr uss usu uuc uue uum uur uus uuu