-er c-- ccc ccd cce ccr ccs ccu ccx cdc cdd cde cdr cds cdu cdx ce- cec ced cee cer ces ceu cex crc crd cre crr crs cru crx csc csd cse csr css csu csx cuc cud cue cur cus cuu cxc cxr cxs cxx dcc dcd dce dcr dcs dcu dcx ddc ddd dde ddr dds ddu ddx de- dec ded dee der des deu dex drc drd dre drr drs dru drx dsc dsd dse dsr dss dsu dsx duc dud due dur dus dux dxc dxd dxr dxs dxx ec- ecc ecd ece ecr ecs ecu ecx ed- edc edd ede edr eds edu edx eec eed eee eer ees eex erc erd ere err ers eru es- esc esd ese esr ess esu esx eu- euc eud eue eur eus eux ex- exc exd exe exr exs exu exx rcc rcd rce rcr rcs rcu rcx rdc rdd rde rdr rds rdu rdx re- rec red ree rer res reu rex rrc rrd rrr rrs rru rsc rsd rse rsr rss rsu rsx ruc rud rue rur rus ruu rux rxr rxs scc scd sce scr scs scu scx sdc sdd sde sdr sds sdu se- sec sed see ser ses seu sex sr- src srd sre srr srs srx ss- ssc ssd sse ssr sss ssu ssx suc sud sue sur sus suu sux sxc sxs sxu ucc ucd uce ucr ucs ucu udc udd ude udr uds udu udx uec ued uee uer ues ur- urc urd ure urr urs uru urx usc usd use usr uss usu usx uuc uue uur uus uuu uxc uxr uxu xcd xcr xcx xdc xde xdr xds xed xee xer xes xeu xex xrc xrd xrx xsc xss xue xus xxx