-er c-- ccc ccd cce ccf ccr ccs cct ccu cdc cdd cde cdf cdr cds cdt cdu ce- cec ced cee cef cer ces cet ceu cfc cfd cfe cff cfr cfs cft cfu crc crd cre crf crr crs crt cru csc csd cse csf csr css cst csu ctc ctd cte ctf ctr cts ctt ctu cuc cud cue cuf cur cus cut cuu dcc dcd dce dcf dcr dcs dct dcu ddc ddd dde ddf ddr dds ddt ddu de- dec ded dee def der des det deu dfc dfd dfe dff dfr dfs dft dfu drc drd dre drr drs drt dru dsc dsd dse dsf dsr dss dst dsu dtc dtd dte dtf dtr dts dtt dtu duc dud due duf dur dus dut ec- ecc ecd ece ecf ecr ecs ect ecu ed- edc edd ede edf edr eds edt edu eec eed eee eef eer ees eet ef- efc efd efe eff efr efs eft erc erd ere erf err ers ert eru es- esc esd ese esf esr ess est esu etc etd ete etf etr ets ett etu eu- euc eud eue euf eur eus eut fcc fcd fce fcf fcr fcs fct fcu fdc fdd fde fdf fdr fds fdt fdu fec fed fee fef fer fes fet feu ffc ffd ffe fff ffr ffs fft ffu frc frd fre frf frr frs frt fru fsc fsd fse fsf fsr fss fst fsu ftc ftd fte ftf ftr fts ftt ftu fud fue fuf fur fus fut fuu rcc rcd rce rcf rcr rcs rct rcu rdc rdd rde rdf rdr rds rdt rdu re- rec red ree ref rer res ret reu rfc rfd rfe rff rfr rfs rft rfu rrc rrd rrf rrr rrs rrt rru rsc rsd rse rsf rsr rss rst rsu rtc rtd rte rtf rtr rts rtt rtu ruc rud rue ruf rur rus rut ruu scc scd sce scf scr scs sct scu sdc sdd sde sdf sdr sds sdt sdu se- sec sed see sef ser ses set seu sfc sfd sfe sff sfr sfs sft sfu sr- src srd sre srf srr srs srt ss- ssc ssd sse ssf ssr sss sst ssu stc std ste stf str sts stt stu suc sud sue suf sur sus sut suu tcc tcd tce tcf tcr tcs tct tcu tdc tdd tde tdf tdr tds tdt tdu te- tec ted tee tef ter tes tet teu tfc tfd tfe tff tfr tfs tft tfu trc trd tre trf trr trs trt tru tsc tsd tse tsf tsr tss tst tsu ttc ttd tte ttf ttr tts ttt ttu tuc tud tue tuf tur tus tut tuu ucc ucd uce ucf ucr ucs uct ucu udc udd ude udf udr uds udt udu uec ued uee uef uer ues uet ufc ufd ufe uff ufr ufs uft ufu ur- urc urd ure urf urr urs urt uru usc usd use usf usr uss ust usu utc utd ute utf utr uts utt utu uuc uue uur uus uut uuu