-er -ic c-- ccc ccd cce cci cck ccr ccs cct cdc cdd cde cdi cdk cdr cds cdt ce- cec ced cee cei cek cer ces cet ci- cic cid cie cii cik cir cis cit ckc ckd cki cks ckt crc crd cre cri crk crr crs crt csc csd cse csi csk csr css cst ctc ctd cte cti ctk ctr cts ctt dcc dcd dce dci dck dcr dcs dct ddc ddd dde ddi ddk ddr dds ddt de- dec ded dee dei dek der des det di- dic did die dii dik dir dis dit dkc dke dki dkk dkr dks dkt drc drd dre dri drk drr drs drt dsc dsd dse dsi dsk dsr dss dst dtc dtd dte dti dtk dtr dts dtt ec- ecc ecd ece eci eck ecr ecs ect ed- edc edd ede edi edk edr eds edt eec eed eee eek eer ees eet eic eid eie eii eik eir eis eit ekc ekd eke eki ekr eks ekt erc erd ere eri erk err ers ert es- esc esd ese esi esk esr ess est etc etd ete eti etk etr ets ett i-d icc icd ice ici ick icr ics ict idc idd ide idi idk idr ids idt ie- iec ied iee iei iek ier ies iet iic iid iie iii iir iis iit ikc ike iki ikk ikr iks ikt ir- irc ird ire iri irk irr irs irt is- isc isd ise isi isk isr iss ist itc itd ite iti itk its itt k-t kcc kcd kce kci kck kcr kcs kct kdc kde kdk kdr kds kdt ke- kec ked kee kei kek ker kes ket kic kid kie kii kik kir kis kit kkc kke kki kkk kkr kks kkt krc krd kri krk krr krs krt ksc ksd kse ksi ksk ksr kss kst ktc kte ktk ktr kts ktt rcc rcd rce rci rcr rcs rct rdc rdd rde rdi rdr rds rdt re- rec red ree rei rek rer res ret ric rid rie rii rik rir ris rit rkc rke rkk rks rkt rrc rrd rri rrk rrr rrs rrt rsc rsd rse rsi rsk rsr rss rst rtc rtd rte rti rtk rtr rts rtt scc scd sce sci sck scr scs sct sdc sdd sde sdi sdk sdr sds sdt se- sec sed see sei sek ser ses set sic sid sie sii sik sir sis sit sk- skc skd ske ski skk skr sks skt sr- src srd sre sri srk srr srs srt ss- ssc ssd sse ssi ssk ssr sss sst stc std ste sti stk str sts stt tcc tcd tce tci tck tcr tcs tct tdc tdd tde tdi tdk tdr tds tdt te- tec ted tee tei tek ter tes tet tic tid tie tii tik tir tis tit tkc tke tkk tkr tks tkt trc trd tre tri trk trr trs trt tsc tsd tse tsi tsk tsr tss tst ttc ttd tte tti ttk ttr tts ttt