-er c-- ccc cce cck ccm ccr ccu ce- cec cee cek cem cer ceu ckc ckm cmc cme cmk cmm cmr cmu crc cre crk crm crr cru cuc cue cuk cum cur cuu ec- ecc ece eck ecm ecr ecu eec eee eek eem eer ekc eke ekr eku em- emc eme emk emm emr emu erc ere erk erm err eru eu- euc eue eur kcc kce kck kcm kcr kcu ke- kec kee kek kem ker kkc kke kkk kkm kkr kku kmc kme kmk kmm kmu krc krk krr kru kuc kue kuk kum kur kuu m-r mc- mcc mce mck mcm mcr mcu mec mee mek mem mer meu mkc mke mkk mkm mkr mku mmc mme mmk mmm mmr mmu mrc mre mrk mrm mrr mru muc mue muk mum mur muu rcc rce rcm rcr rcu re- rec ree rek rem rer reu rkc rke rkk rkm rku rmc rme rmm rmr rrc rrk rrm rrr rru ruc rue ruk rum rur ruu ucc uce uck ucm ucr ucu uec uee uem uer ukc uke ukk ukr uku um- umc ume umm umr umu ur- urc ure urk urm urr uru uuc uue uum uur uuu