-er c-- ccc cce ccm cco ccr ccu ce- cec cee cem ceo cer ceu cmc cme cmm cmo cmr cmu co- coc coe com coo cor cou crc cre crm cro crr cru cuc cue cum cuo cur cuu ec- ecc ece ecm eco ecr ecu eec eee eem eeo eer em- emc eme emm emo emr emu eo- eoc eoe eom eoo eor eou erc ere erm ero err eru eu- euc eue eur m-o m-r mc- mcc mce mcm mco mcr mcu mec mee mem meo mer meu mmc mme mmm mmo mmr mmu moc moe mom moo mor mou mrc mre mrm mro mrr mru muc mue mum mur muu oc- occ ocm oco ocr ocu oec oee oem oeo oer om- omc ome omm omo omr omu oo- ooc oom ooo oor or- orc ore orm oro orr oru ou- ouc oue oum ouo our rcc rce rcm rco rcr rcu re- rec ree rem reo rer reu rmc rme rmm rmo rmr roc roe rom roo ror rou rrc rrm rrr rru ruc rue rum ruo rur ruu ucc uce ucm uco ucr ucu uec uee uem uer um- umc ume umm umo umr umu uoc uoe uom uoo uor ur- urc ure urm uro urr uru uuc uue uum uur uuu