-er c-- ccc ccd cce ccl ccr ccs ccu cdc cdd cde cdl cdr cds cdu ce- cec ced cee cel cer ces ceu cl- clc cld cle cll clr cls clu crc crd cre crl crr crs cru csc csd cse csl csr css csu cuc cud cue cul cur cus cuu dcc dcd dce dcl dcr dcs dcu ddc ddd dde ddl ddr dds ddu de- dec ded dee del der des deu dl- dlc dld dle dll dlr dls dlu drc drd dre drl drr drs dru dsc dsd dse dsl dsr dss dsu duc dud due dul dur dus ec- ecc ecd ece ecl ecr ecs ecu ed- edc edd ede edl edr eds edu eec eed eee eel eer ees elc eld ele ell elr els elu erc erd ere erl err ers eru es- esc esd ese esl esr ess esu eu- euc eud eue eul eur eus lcc lcd lce lcl lcr lcs lcu ldc ldd lde ldl ldr lds ldu lec led lee lel ler les leu 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 rcc rcd rce rcl rcr rcs rcu rdc rdd rde rdl rdr rds rdu re- rec red ree rel rer res reu rlc rld rle rll rlr rls rlu rrc rrd rrl rrr rrs rru rsc rsd rse rsl rsr rss rsu ruc rud rue rur rus ruu scc scd sce scl scr scs scu sdc sdd sde sdl sdr sds sdu se- sec sed see sel ser ses seu slc sld sle sll slr sls slu sr- src srd sre srl srr srs ss- ssc ssd sse ssl ssr sss ssu suc sud sue sul sur sus suu ucc ucd uce ucl ucr ucs ucu udc udd ude udl udr uds udu uec ued uee uel uer ues ulc uld ule ull ulr uls ulu ur- urc urd ure url urr urs uru usc usd use usl usr uss usu uuc uue uur uus uuu