-er c-- ccc cce cco ccr cct ccu ce- cec cee ceo ceq cer cet ceu co- coc coe coo coq cor cot cou cqc cqo cqt crc cre cro crq crr crt cru ctc cte cto ctq ctr ctt ctu cuc cue cuo cuq cur cut cuu ec- ecc ece eco ecq ecr ect ecu eec eee eeo eer eet eo- eoc eoe eoo eoq eor eot eou eqe eqq eqt equ erc ere ero erq 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 oqo or- orc ore oro orr ort oru ot- otc ote oto otr ott otu ou- ouc oue ouo our out qcc qco qct qec qee qeo qet qoo qor qqq qqu qrc qre qrt qru qtc qto qtq qtr qu- que quo qur qut rcc rce rco rcr rct rcu re- rec ree reo req rer ret reu roc roe roo ror rot rou rqc rrc rrq rrr rrt rru rtc rte rto rtq rtr rtt rtu ruc rue ruo rur rut ruu tcc tce tco tcr tct tcu te- tec tee teo teq ter tet teu to- toc toe too toq tor tot tou tqo trc tre tro trq 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