-er -ic c-- ccc ccd cce cci cco ccr ccs cct cdc cdd cde cdi cdo cdr cds cdt ce- cec ced cee cei ceo cer ces cet ci- cic cid cie cii cio cir cis cit co- coc cod coe coi coo cor cos cot crc crd cre cri cro crr crs crt csc csd cse csi cso csr css cst ctc ctd cte cti cto ctr cts ctt dcc dcd dce dci dco dcr dcs dct ddc ddd dde ddi ddo ddr dds ddt de- dec ded dee dei deo der des det di- dic did die dii dio dir dis dit doc dod doe doi doo dor dos dot drc drd dre dri dro drr drs drt dsc dsd dse dsi dso dsr dss dst dtc dtd dte dti dto dtr dts dtt ec- ecc ecd ece eci eco ecr ecs ect ed- edc edd ede edi edo edr eds edt eec eed eee eeo eer ees eet eic eid eie eii eio eir eis eit eo- eoc eod eoe eoi eoo eor eos eot erc erd ere eri ero err ers ert es- esc esd ese esi eso esr ess est etc etd ete eti eto etr ets ett i-d icc icd ice ici ico icr ics ict idc idd ide idi ido idr ids idt ie- iec ied iee iei ier ies iet iic iid iie iii iio iir iis iit io- ioc iod ioe ioi ioo ior ios iot ir- irc ird ire iri iro irr irs irt is- isc isd ise isi iso isr iss ist itc itd ite iti ito its itt o-i oc- occ ocd oci oco ocr ocs oct odc odd ode odi odo odr ods odt oec oed oee oei oeo oer oes oet oic oid oie oii oio oir ois oit oo- ooc ood ooi ooo oor oos oot or- orc ord ore ori oro orr ors ort os- osc osd ose osi oso osr oss ost ot- otc otd ote oti oto otr ots ott rcc rcd rce rci rco rcr rcs rct rdc rdd rde rdi rdo rdr rds rdt re- rec red ree rei reo rer res ret ric rid rie rii rio rir ris rit roc rod roe roi roo ror ros rot rrc rrd rri rrr rrs rrt rsc rsd rse rsi rso rsr rss rst rtc rtd rte rti rto rtr rts rtt scc scd sce sci sco scr scs sct sdc sdd sde sdi sdo sdr sds sdt se- sec sed see sei seo ser ses set sic sid sie sii sio sir sis sit soc sod soe soi soo sor sos sot sr- src srd sre sri sro srr srs srt ss- ssc ssd sse ssi sso ssr sss sst stc std ste sti sto str sts stt tcc tcd tce tci tco tcr tcs tct tdc tdd tde tdi tdo tdr tds tdt te- tec ted tee tei teo ter tes tet tic tid tie tii tio tir tis tit to- toc tod toe toi too tor tos tot trc trd tre tri tro trr trs trt tsc tsd tse tsi tso tsr tss tst ttc ttd tte tti tto ttr tts ttt