-er -ic c-- ccc cce ccf cci cck ccr ccs cct ce- cec cee cef cei cek cer ces cet cfc cfe cff cfi cfk cfr cfs cft ci- cic cie cif cii cik cir cis cit ckc cki cks ckt crc cre crf cri crk crr crs crt csc cse csf csi csk csr css cst ctc cte ctf cti ctk ctr cts ctt ec- ecc ece ecf eci eck ecr ecs ect eec eee eef eek eer ees eet ef- efc efe eff efi efr efs eft eic eie eif eii eik eir eis eit ekc eke ekf eki ekr eks ekt erc ere erf eri erk err ers ert es- esc ese esf esi esk esr ess est etc ete etf eti etk etr ets ett fcc fce fcf fci fck fcr fcs fct fec fee fef fei fek fer fes fet ffc ffe fff ffi ffk ffr ffs fft fic fie fif fii fik fir fis fit fkc fkf fki fkk fkt frc fre frf fri frk frr frs frt fsc fse fsf fsi fsk fsr fss fst ftc fte ftf fti ftk ftr fts ftt i-f icc ice icf ici ick icr ics ict ie- iec iee ief iei iek ier ies iet ifc ife iff ifi ifr ifs ift iic iie iif iii iir iis iit ikc ike ikf iki ikk ikr iks ikt ir- irc ire irf iri irk irr irs irt is- isc ise isf isi isk isr iss ist itc ite itf iti itk its itt k-t kcc kce kci kck kcr kcs kct ke- kec kee kef kei kek ker kes ket kfc kff kfi kfs kic kie kif kii kik kir kis kit kkc kke kki kkk kkr kks kkt krc krf kri krk krr krs krt ksc kse ksf ksi ksk ksr kss kst ktc kte ktf ktk ktr kts ktt rcc rce rcf rci rcr rcs rct re- rec ree ref rei rek rer res ret rfc rfe rff rfi rfk rfr rfs rft ric rie rif rii rik rir ris rit rkc rke rkf rkk rks rkt rrc rrf rri rrk rrr rrs rrt rsc rse rsf rsi rsk rsr rss rst rtc rte rtf rti rtk rtr rts rtt scc sce scf sci sck scr scs sct se- sec see sef sei sek ser ses set sfc sfe sff sfi sfk sfr sfs sft sic sie sif sii sik sir sis sit sk- skc ske skf ski skk skr sks skt sr- src sre srf sri srk srr srs srt ss- ssc sse ssf ssi ssk ssr sss sst stc ste stf sti stk str sts stt tcc tce tcf tci tck tcr tcs tct te- tec tee tef tei tek ter tes tet tfc tfe tff tfi tfk tfr tfs tft tic tie tif tii tik tir tis tit tkc tke tkk tkr tks tkt trc tre trf tri trk trr trs trt tsc tse tsf tsi tsk tsr tss tst ttc tte ttf tti ttk ttr tts ttt