-er c-- ccc cce ccm ccn ccr ccu ce- cec cee cem cen cer ceu cmc cme cmm cmn cmr cmu cn- cnc cne cnm cnn cnr cnu crc cre crm crn crr cru cuc cue cum cun cur cuu ec- ecc ece ecm ecn ecr ecu eec eee eem een eer em- emc eme emm emn emr emu en- enc ene enm enn enr enu erc ere erm ern err eru eu- euc eue eun eur m-r mc- mcc mce mcm mcn mcr mcu mec mee mem men mer meu mmc mme mmm mmn mmr mmu mnc mne mnm mnn mnr mnu mrc mre mrm mrn mrr mru muc mue mum mun mur muu ncc nce ncm ncn ncr ncu ne- nec nee nem nen ner neu nmc nme nmm nmn nmr nmu nnc nne nnm nnn nnu nrc nre nrm nrn nrr nru nuc nue num nun nur nuu rcc rce rcm rcn rcr rcu re- rec ree rem ren rer reu rmc rme rmm rmn rmr rnc rnm rnn rnr rnu rrc rrm rrn rrr rru ruc rue rum run rur ruu ucc uce ucm ucn ucr ucu uec uee uem uen uer um- umc ume umm umn umr umu un- unc une unm unn unr unu ur- urc ure urm urn urr uru uuc uue uum uun uur uuu