-er c-- ccc ccd cce ccl ccr ccs ccu ccx cdc cdd cde cdl cdr cds cdu cdx ce- cec ced cee cel cer ces ceu cex cl- clc cld cle cll clr cls clu clx crc crd cre crl crr crs cru crx csc csd cse csl csr css csu csx cuc cud cue cul cur cus cuu cxc cxl cxr cxs cxx dcc dcd dce dcl dcr dcs dcu dcx ddc ddd dde ddl ddr dds ddu ddx de- dec ded dee del der des deu dex dl- dlc dld dle dll dlr dls dlu dlx drc drd dre drl drr drs dru drx dsc dsd dse dsl dsr dss dsu dsx duc dud due dul dur dus dux dxc dxd dxl dxr dxs dxx ec- ecc ecd ece ecl ecr ecs ecu ecx ed- edc edd ede edl edr eds edu edx eec eed eee eel eer ees eex elc eld ele ell elr els elu elx erc erd ere erl err ers eru es- esc esd ese esl esr ess esu esx eu- euc eud eue eul eur eus eux ex- exc exd exe exl exr exs exu exx lcc lcd lce lcl lcr lcs lcu lcx ldc ldd lde ldl ldr lds ldu lec led lee lel ler les leu lex llc lld lle lll llr lls llu lrc lrd lrr lrs lru lsc lsd lse lsl lsr lss lsu luc lud lue lul lur lus luu lux lxc lxd lxr lxx rcc rcd rce rcl rcr rcs rcu rcx rdc rdd rde rdl rdr rds rdu rdx re- rec red ree rel rer res reu rex rlc rld rle rll rlr rls rlu rrc rrd rrl rrr rrs rru rsc rsd rse rsl rsr rss rsu rsx ruc rud rue rur rus ruu rux rxr rxs scc scd sce scl scr scs scu scx sdc sdd sde sdl sdr sds sdu se- sec sed see sel ser ses seu sex slc sld sle sll slr sls slu slx sr- src srd sre srl srr srs srx ss- ssc ssd sse ssl ssr sss ssu ssx suc sud sue sul sur sus suu sux sxc sxl sxs sxu ucc ucd uce ucl ucr ucs ucu udc udd ude udl udr uds udu udx uec ued uee uel uer ues ulc uld ule ull ulr uls ulu ur- urc urd ure url urr urs uru urx usc usd use usl usr uss usu usx uuc uue uur uus uuu uxc uxr uxu xcd xcl xcr xcx xdc xde xdr xds xed xee xel xer xes xeu xex xld xlr xls xrc xrd xrx xsc xsl xss xue xul xus xxl xxx