-er -ic c-- ccc ccd cce ccf cci cck ccr ccs cdc cdd cde cdf cdi cdk cdr cds ce- cec ced cee cef cei cek cer ces cfc cfd cfe cff cfi cfk cfr cfs ci- cic cid cie cif cii cik cir cis ckc ckd cki cks crc crd cre crf cri crk crr crs csc csd cse csf csi csk csr css dcc dcd dce dcf dci dck dcr dcs ddc ddd dde ddf ddi ddk ddr dds de- dec ded dee def dei dek der des dfc dfd dfe dff dfi dfk dfr dfs di- dic did die dif dii dik dir dis dkc dke dki dkk dkr dks drc drd dre dri drk drr drs dsc dsd dse dsf dsi dsk dsr dss ec- ecc ecd ece ecf eci eck ecr ecs ed- edc edd ede edf edi edk edr eds eec eed eee eef eek eer ees ef- efc efd efe eff efi efr efs eic eid eie eif eii eik eir eis ekc ekd eke ekf eki ekr eks erc erd ere erf eri erk err ers es- esc esd ese esf esi esk esr ess fcc fcd fce fcf fci fck fcr fcs fdc fdd fde fdf fdi fdk fdr fds fec fed fee fef fei fek fer fes ffc ffd ffe fff ffi ffk ffr ffs fic fid fie fif fii fik fir fis fkc fkf fki fkk frc frd fre frf fri frk frr frs fsc fsd fse fsf fsi fsk fsr fss i-d i-f icc icd ice icf ici ick icr ics idc idd ide idf idi idk idr ids ie- iec ied iee ief iei iek ier ies ifc ifd ife iff ifi ifr ifs iic iid iie iif iii iir iis ikc ike ikf iki ikk ikr iks ir- irc ird ire irf iri irk irr irs is- isc isd ise isf isi isk isr iss kcc kcd kce kci kck kcr kcs kdc kde kdf kdk kdr kds ke- kec ked kee kef kei kek ker kes kfc kfd kff kfi kfs kic kid kie kif kii kik kir kis kkc kke kki kkk kkr kks krc krd krf kri krk krr krs ksc ksd kse ksf ksi ksk ksr kss rcc rcd rce rcf rci rcr rcs rdc rdd rde rdf rdi rdr rds re- rec red ree ref rei rek rer res rfc rfd rfe rff rfi rfk rfr rfs ric rid rie rif rii rik rir ris rkc rke rkf rkk rks rrc rrd rrf rri rrk rrr rrs rsc rsd rse rsf rsi rsk rsr rss scc scd sce scf sci sck scr scs sdc sdd sde sdf sdi sdk sdr sds se- sec sed see sef sei sek ser ses sfc sfd sfe sff sfi sfk sfr sfs sic sid sie sif sii sik sir sis sk- skc skd ske skf ski skk skr sks sr- src srd sre srf sri srk srr srs ss- ssc ssd sse ssf ssi ssk ssr sss