-er c-- ccc cce ccr ccu ccv ce- cec cee cer ceu cev crc cre crr cru crv cuc cue cur cuu cuv cvc cve cvr cvu cvv ec- ecc ece ecr ecu ecv eec eee eer eev erc ere err eru erv eu- euc eue eur euv evc eve evr evv rcc rce rcr rcu rcv re- rec ree rer reu rev rrc rrr rru ruc rue rur ruu ruv rvc rve rvr rvu rvv ucc uce ucr ucu ucv uec uee uer ur- urc ure urr uru uuc uue uur uuu uvc uve uvu uvv v-e vcc vce vcr vcu vec vee ver veu vrc vre vrr vru vue vur vuv vvc vvr vvv