-er c-- ccc cce ccn ccr ccu ccv ce- cec cee cen cer ceu cev cn- cnc cne cnn cnr cnu cnv crc cre crn crr cru crv cuc cue cun cur cuu cuv cvc cve cvn cvr cvu cvv ec- ecc ece ecn ecr ecu ecv eec eee een eer eev en- enc ene enn enr enu env erc ere ern err eru erv eu- euc eue eun eur euv evc eve evn evr evv ncc nce ncn ncr ncu ncv ne- nec nee nen ner neu nev nnc nne nnn nnu nnv nrc nre nrn nrr nru nrv nuc nue nun nur nuu nuv nvc nve nvn nvu nvv rcc rce rcn rcr rcu rcv re- rec ree ren rer reu rev rnc rnn rnr rnu rnv rrc rrn rrr rru ruc rue run rur ruu ruv rvc rve rvn rvr rvu rvv ucc uce ucn ucr ucu ucv uec uee uen uer un- unc une unn unr unu unv ur- urc ure urn urr uru uuc uue uun uur uuu uvc uve uvu uvv v-e vcc vce vcn vcr vcu vec vee ven ver veu vn- vnr vnu vnv vrc vre vrn vrr vru vue vur vuv vvc vvr vvv