-er -ol c-- ccc ccd cce ccl cco ccr ccs cdc cdd cde cdl cdo cdr cds ce- cec ced cee cel ceo cer ces cl- clc cld cle cll clo clr cls co- coc cod coe col coo cor cos crc crd cre crl cro crr crs csc csd cse csl cso csr css dcc dcd dce dcl dco dcr dcs ddc ddd dde ddl ddo ddr dds de- dec ded dee del deo der des dl- dlc dld dle dll dlo dlr dls doc dod doe dol doo dor dos drc drd dre drl dro drr drs dsc dsd dse dsl dso dsr dss ec- ecc ecd ece ecl eco ecr ecs ed- edc edd ede edl edo edr eds eec eed eee eel eeo eer ees elc eld ele ell elo elr els eo- eoc eod eoe eol eoo eor eos erc erd ere erl ero err ers es- esc esd ese esl eso esr ess lcc lcd lce lcl lco lcr lcs ldc ldd lde ldl ldo ldr lds lec led lee lel leo ler les llc lld lle lll llo llr lls loc lod loe lol loo lor los lrc lrd lro lrr lrs lsc lsd lse lsl lso lsr lss oc- occ ocd ocl oco ocr ocs odc odd ode odl odo odr ods oec oed oee oel oeo oer oes olc old ole oll olo ols oo- ooc ood ool ooo oor oos or- orc ord ore orl oro orr ors os- osc osd ose osl oso osr oss rcc rcd rce rcl rco rcr rcs rdc rdd rde rdl rdo rdr rds re- rec red ree rel reo rer res rlc rld rle rll rlo rlr rls roc rod roe rol roo ror ros rrc rrd rrl rrr rrs rsc rsd rse rsl rso rsr rss scc scd sce scl sco scr scs sdc sdd sde sdl sdo sdr sds se- sec sed see sel seo ser ses slc sld sle sll slo slr sls soc sod soe sol soo sor sos sr- src srd sre srl sro srr srs ss- ssc ssd sse ssl sso ssr sss