-er c-- ccc cce cco ccr ccu ce- cec cee ceo ceq cer ceu co- coc coe coo coq cor cou cqc cqo crc cre cro crq crr cru cuc cue cuo cuq cur cuu ec- ecc ece eco ecq ecr ecu eec eee eeo eer eo- eoc eoe eoo eoq eor eou eqe eqq equ erc ere ero erq err eru eu- euc eue eur oc- occ oco ocr ocu oec oee oeo oer oo- ooc ooo oor oqo or- orc ore oro orr oru ou- ouc oue ouo our qcc qco qec qee qeo qoo qor qqq qqu qrc qre qru qu- que quo qur rcc rce rco rcr rcu re- rec ree reo req rer reu roc roe roo ror rou rqc rrc rrq rrr rru ruc rue ruo rur ruu ucc uce uco ucr ucu uec uee uer uoc uoe uoo uor ur- urc ure uro urr uru uuc uue uur uuu