-er -ic c-- ccc cce ccf cci cck ccl ccr ccs ce- cec cee cef cei cek cel cer ces cfc cfe cff cfi cfk cfl cfr cfs ci- cic cie cif cii cik cil cir cis ckc cki cks cl- clc cle clf cli clk cll clr cls crc cre crf cri crk crl crr crs csc cse csf csi csk csl csr css ec- ecc ece ecf eci eck ecl ecr ecs eec eee eef eek eel eer ees ef- efc efe eff efi efl efr efs eic eie eif eii eik eil eir eis ekc eke ekf eki ekl ekr eks elc ele elf eli elk ell elr els erc ere erf eri erk erl err ers es- esc ese esf esi esk esl esr ess fcc fce fcf fci fck fcl fcr fcs fec fee fef fei fek fel fer fes ffc ffe fff ffi ffk ffl ffr ffs fic fie fif fii fik fil fir fis fkc fkf fki fkk fkl flc fle flf fli fll flr fls frc fre frf fri frk frl frr frs fsc fse fsf fsi fsk fsl fsr fss i-f icc ice icf ici ick icl icr ics ie- iec iee ief iei iek iel ier ies ifc ife iff ifi ifl ifr ifs iic iie iif iii iil iir iis ikc ike ikf iki ikk ikl ikr iks il- ilc ile ilf ili ilk ill ilr ils ir- irc ire irf iri irk irl irr irs is- isc ise isf isi isk isl isr iss kcc kce kci kck kcl kcr kcs ke- kec kee kef kei kek kel ker kes kfc kff kfi kfs kic kie kif kii kik kil kir kis kkc kke kki kkk kkl kkr kks kl- klc klf kli klr kls krc krf kri krk krl krr krs ksc kse ksf ksi ksk ksl ksr kss lcc lce lcf lci lck lcl lcr lcs lec lee lef lei lek lel ler les lfc lfe lff lfi lfk lfl lfr lfs lic lie lif lii lik lil lir lis lkl lkr lks llc lle llf lli llk lll llr lls lrc lrf lri lrk lrr lrs lsc lse lsf lsi lsk lsl lsr lss rcc rce rcf rci rcl rcr rcs re- rec ree ref rei rek rel rer res rfc rfe rff rfi rfk rfl rfr rfs ric rie rif rii rik ril rir ris rkc rke rkf rkk rks rlc rle rlf rli rll rlr rls rrc rrf rri rrk rrl rrr rrs rsc rse rsf rsi rsk rsl rsr rss scc sce scf sci sck scl scr scs se- sec see sef sei sek sel ser ses sfc sfe sff sfi sfk sfl sfr sfs sic sie sif sii sik sil sir sis sk- skc ske skf ski skk skl skr sks slc sle slf sli slk sll slr sls sr- src sre srf sri srk srl srr srs ss- ssc sse ssf ssi ssk ssl ssr sss