-er c-- ccc ccd cce cco ccr ccs cct cdc cdd cde cdo cdr cds cdt ce- cec ced cee ceo cer ces cet co- coc cod coe coo cor cos cot crc crd cre cro crr crs crt csc csd cse cso csr css cst ctc ctd cte cto ctr cts ctt dcc dcd dce dco dcr dcs dct ddc ddd dde ddo ddr dds ddt de- dec ded dee deo der des det doc dod doe doo dor dos dot drc drd dre dro drr drs drt dsc dsd dse dso dsr dss dst dtc dtd dte dto dtr dts dtt ec- ecc ecd ece eco ecr ecs ect ed- edc edd ede edo edr eds edt eec eed eee eeo eer ees eet eo- eoc eod eoe eoo eor eos eot erc erd ere ero err ers ert es- esc esd ese eso esr ess est etc etd ete eto etr ets ett oc- occ ocd oco ocr ocs oct odc odd ode odo odr ods odt oec oed oee oeo oer oes oet oo- ooc ood ooo oor oos oot or- orc ord ore oro orr ors ort os- osc osd ose oso osr oss ost ot- otc otd ote oto otr ots ott rcc rcd rce rco rcr rcs rct rdc rdd rde rdo rdr rds rdt re- rec red ree reo rer res ret roc rod roe roo ror ros rot rrc rrd rrr rrs rrt rsc rsd rse rso rsr rss rst rtc rtd rte rto rtr rts rtt scc scd sce sco scr scs sct sdc sdd sde sdo sdr sds sdt se- sec sed see seo ser ses set soc sod soe soo sor sos sot sr- src srd sre sro srr srs srt ss- ssc ssd sse sso ssr sss sst stc std ste sto str sts stt tcc tcd tce tco tcr tcs tct tdc tdd tde tdo tdr tds tdt te- tec ted tee teo ter tes tet to- toc tod toe too tor tos tot trc trd tre tro trr trs trt tsc tsd tse tso tsr tss tst ttc ttd tte tto ttr tts ttt