-er c-- ccc cce cco ccr cct ccu ce- cec cee ceo cer cet ceu co- coc coe coo cor cot cou crc cre cro crr crt cru ctc cte cto ctr ctt ctu cuc cue cuo cur cut cuu ec- ecc ece eco ecr ect ecu eec eee eeo eer eet eo- eoc eoe eoo eor eot eou erc ere ero err ert eru etc ete eto etr ett etu eu- euc eue eur eut oc- occ oco ocr oct ocu oec oee oeo oer oet oo- ooc ooo oor oot or- orc ore oro orr ort oru ot- otc ote oto otr ott otu ou- ouc oue ouo our out rcc rce rco rcr rct rcu re- rec ree reo rer ret reu roc roe roo ror rot rou rrc rrr rrt rru rtc rte rto rtr rtt rtu ruc rue ruo rur rut ruu tcc tce tco tcr tct tcu te- tec tee teo ter tet teu to- toc toe too tor tot tou trc tre tro trr trt tru ttc tte tto ttr ttt ttu tuc tue tuo tur tut tuu ucc uce uco ucr uct ucu uec uee uer uet uoc uoe uoo uor uot ur- urc ure uro urr urt uru utc ute uto utr utt utu uuc uue uur uut uuu