-er c-- ccc ccd cce ccf cck ccr ccs ccu cdc cdd cde cdf cdk cdr cds cdu ce- cec ced cee cef cek cer ces ceu cfc cfd cfe cff cfk cfr cfs cfu ckc ckd cks crc crd cre crf crk crr crs cru csc csd cse csf csk csr css csu cuc cud cue cuf cuk cur cus cuu dcc dcd dce dcf dck dcr dcs dcu ddc ddd dde ddf ddk ddr dds ddu de- dec ded dee def dek der des deu dfc dfd dfe dff dfk dfr dfs dfu dkc dke dkk dkr dks dku drc drd dre drk drr drs dru dsc dsd dse dsf dsk dsr dss dsu duc dud due duf duk dur dus ec- ecc ecd ece ecf eck ecr ecs ecu ed- edc edd ede edf edk edr eds edu eec eed eee eef eek eer ees ef- efc efd efe eff efr efs ekc ekd eke ekf ekr eks eku erc erd ere erf erk err ers eru es- esc esd ese esf esk esr ess esu eu- euc eud eue euf eur eus fcc fcd fce fcf fck fcr fcs fcu fdc fdd fde fdf fdk fdr fds fdu fec fed fee fef fek fer fes feu ffc ffd ffe fff ffk ffr ffs ffu fkc fkf fkk frc frd fre frf frk frr frs fru fsc fsd fse fsf fsk fsr fss fsu fud fue fuf fuk fur fus fuu kcc kcd kce kck kcr kcs kcu kdc kde kdf kdk kdr kds kdu ke- kec ked kee kef kek ker kes kfc kfd kff kfs kfu kkc kke kkk kkr kks kku krc krd krf krk krr krs kru ksc ksd kse ksf ksk ksr kss ksu kuc kud kue kuk kur kus kuu rcc rcd rce rcf rcr rcs rcu rdc rdd rde rdf rdr rds rdu re- rec red ree ref rek rer res reu rfc rfd rfe rff rfk rfr rfs rfu rkc rke rkf rkk rks rku rrc rrd rrf rrk rrr rrs rru rsc rsd rse rsf rsk rsr rss rsu ruc rud rue ruf ruk rur rus ruu scc scd sce scf sck scr scs scu sdc sdd sde sdf sdk sdr sds sdu se- sec sed see sef sek ser ses seu sfc sfd sfe sff sfk sfr sfs sfu sk- skc skd ske skf skk skr sks sku sr- src srd sre srf srk srr srs ss- ssc ssd sse ssf ssk ssr sss ssu suc sud sue suf suk sur sus suu ucc ucd uce ucf uck ucr ucs ucu udc udd ude udf udk udr uds udu uec ued uee uef uer ues ufc ufd ufe uff ufr ufs ufu ukc uke ukf ukk ukr uku ur- urc urd ure urf urk urr urs uru usc usd use usf usk usr uss usu uuc uue uur uus uuu