-er c-- ccc cce ccr cct ccu ce- cec cee cer cet ceu crc cre crr crt cru ctc cte ctr ctt ctu cuc cue cur cut cuu ec- ecc ece ecr ect ecu eec eee eer eet erc ere err ert eru etc ete etr ett etu eu- euc eue eur eut rcc rce rcr rct rcu re- rec ree rer ret reu rrc rrr rrt rru rtc rte rtr rtt rtu ruc rue rur rut ruu tcc tce tcr tct tcu te- tec tee ter tet teu trc tre trr trt tru ttc tte ttr ttt ttu tuc tue tur tut tuu ucc uce ucr uct ucu uec uee uer uet ur- urc ure urr urt uru utc ute utr utt utu uuc uue uur uut uuu