-er -ic c-- ccc ccd cce cci ccr ccs cct cdc cdd cde cdi cdr cds cdt ce- cec ced cee cei cer ces cet ci- cic cid cie cii cir cis cit crc crd cre cri crr crs crt csc csd cse csi csr css cst ctc ctd cte cti ctr cts ctt dcc dcd dce dci dcr dcs dct ddc ddd dde ddi ddr dds ddt de- dec ded dee dei der des det di- dic did die dii dir dis dit drc drd dre dri drr drs drt dsc dsd dse dsi dsr dss dst dtc dtd dte dti dtr dts dtt ec- ecc ecd ece eci ecr ecs ect ed- edc edd ede edi edr eds edt eec eed eee eer ees eet eic eid eie eii eir eis eit erc erd ere eri err ers ert es- esc esd ese esi esr ess est etc etd ete eti etr ets ett i-d icc icd ice ici icr ics ict idc idd ide idi idr ids idt ie- iec ied iee iei ier ies iet iic iid iie iii iir iis iit ir- irc ird ire iri irr irs irt is- isc isd ise isi isr iss ist itc itd ite iti its itt rcc rcd rce rci rcr rcs rct rdc rdd rde rdi rdr rds rdt re- rec red ree rei rer res ret ric rid rie rii rir ris rit rrc rrd rri rrr rrs rrt rsc rsd rse rsi rsr rss rst rtc rtd rte rti rtr rts rtt scc scd sce sci scr scs sct sdc sdd sde sdi sdr sds sdt se- sec sed see sei ser ses set sic sid sie sii sir sis sit sr- src srd sre sri srr srs srt ss- ssc ssd sse ssi ssr sss sst stc std ste sti str sts stt tcc tcd tce tci tcr tcs tct tdc tdd tde tdi tdr tds tdt te- tec ted tee tei ter tes tet tic tid tie tii tir tis tit trc trd tre tri trr trs trt tsc tsd tse tsi tsr tss tst ttc ttd tte tti ttr tts ttt