-er c-- ccc ccd cce ccm ccr ccu cdc cdd cde cdm cdr cdu ce- cec ced cee cem cer ceu cmc cmd cme cmm cmr cmu crc crd cre crm crr cru cuc cud cue cum cur cuu dcc dcd dce dcm dcr dcu ddc ddd dde ddm ddr ddu de- dec ded dee dem der deu dmc dmd dme dmm dmr dmu drc drd dre drm drr dru duc dud due dum dur ec- ecc ecd ece ecm ecr ecu ed- edc edd ede edm edr edu eec eed eee eem eer em- emc emd eme emm emr emu erc erd ere erm err eru eu- euc eud eue eur m-r mc- mcc mcd mce mcm mcr mcu mdc mdd mde mdm mdr mdu mec med mee mem mer meu mmc mmd mme mmm mmr mmu mrc mrd mre mrm mrr mru muc mud mue mum mur muu rcc rcd rce rcm rcr rcu rdc rdd rde rdm rdr rdu re- rec red ree rem rer reu rmc rmd rme rmm rmr rrc rrd rrm rrr rru ruc rud rue rum rur ruu ucc ucd uce ucm ucr ucu udc udd ude udm udr udu uec ued uee uem uer um- umc umd ume umm umr umu ur- urc urd ure urm urr uru uuc uue uum uur uuu