-er -ol c-- ccc ccd cce ccl cco ccr ccs ccu cdc cdd cde cdl cdo cdr cds cdu ce- cec ced cee cel ceo cer ces ceu cl- clc cld cle cll clo clr cls clu co- coc cod coe col coo cor cos cou crc crd cre crl cro crr crs cru csc csd cse csl cso csr css csu cuc cud cue cul cuo cur cus cuu dcc dcd dce dcl dco dcr dcs dcu ddc ddd dde ddl ddo ddr dds ddu de- dec ded dee del deo der des deu dl- dlc dld dle dll dlo dlr dls dlu doc dod doe dol doo dor dos dou drc drd dre drl dro drr drs dru dsc dsd dse dsl dso dsr dss dsu duc dud due dul duo dur dus ec- ecc ecd ece ecl eco ecr ecs ecu ed- edc edd ede edl edo edr eds edu eec eed eee eel eeo eer ees elc eld ele ell elo elr els elu eo- eoc eod eoe eol eoo eor eos eou erc erd ere erl ero err ers eru es- esc esd ese esl eso esr ess esu eu- euc eud eue eul eur eus lcc lcd lce lcl lco lcr lcs lcu ldc ldd lde ldl ldo ldr lds ldu lec led lee lel leo ler les leu llc lld lle lll llo llr lls llu loc lod loe lol loo lor los lou lrc lrd lro lrr lrs lru lsc lsd lse lsl lso lsr lss lsu luc lud lue lul luo lur lus luu oc- occ ocd ocl oco ocr ocs ocu odc odd ode odl odo odr ods odu oec oed oee oel oeo oer oes olc old ole oll olo ols olu oo- ooc ood ool ooo oor oos or- orc ord ore orl oro orr ors oru os- osc osd ose osl oso osr oss osu ou- ouc oud oue oul ouo our ous rcc rcd rce rcl rco rcr rcs rcu rdc rdd rde rdl rdo rdr rds rdu re- rec red ree rel reo rer res reu rlc rld rle rll rlo rlr rls rlu roc rod roe rol roo ror ros rou rrc rrd rrl rrr rrs rru rsc rsd rse rsl rso rsr rss rsu ruc rud rue ruo rur rus ruu scc scd sce scl sco scr scs scu sdc sdd sde sdl sdo sdr sds sdu se- sec sed see sel seo ser ses seu slc sld sle sll slo slr sls slu soc sod soe sol soo sor sos sou sr- src srd sre srl sro srr srs ss- ssc ssd sse ssl sso ssr sss ssu suc sud sue sul suo sur sus suu ucc ucd uce ucl uco ucr ucs ucu udc udd ude udl udo udr uds udu uec ued uee uel uer ues ulc uld ule ull ulo ulr uls ulu uoc uod uoe uol uoo uor uos ur- urc urd ure url uro urr urs uru usc usd use usl uso usr uss usu uuc uue uur uus uuu