-er a-a a-c aaa aac aad aae aaf aar aas ac- aca acc acd ace acf acr acs ad- ada adc add ade adf adr ads aea aec aed aee aef aer aes af- afa afc afd afe aff afr afs ar- ara arc ard are arf arr ars as- asa asc asd ase asf asr ass c-- caa cac cad cae caf car cas cca ccc ccd cce ccf ccr ccs cda cdc cdd cde cdf cdr cds ce- cea cec ced cee cef cer ces cfa cfc cfd cfe cff cfr cfs cra crc crd cre crf crr crs csa csc csd cse csf csr css daa dac dad dae daf dar das dca dcc dcd dce dcf dcr dcs dda ddc ddd dde ddf ddr dds de- dea dec ded dee def der des dfa dfc dfd dfe dff dfr dfs dra drc drd dre drr drs dsa dsc dsd dse dsf dsr dss eaa eac ead eae eaf ear eas ec- eca ecc ecd ece ecf ecr ecs ed- eda edc edd ede edf edr eds eea eec eed eee eef eer ees ef- efa efc efd efe eff efr efs era erc erd ere erf err ers es- esa esc esd ese esf esr ess faa fac fad fae faf far fas fca fcc fcd fce fcf fcr fcs fda fdc fdd fde fdf fdr fds fea fec fed fee fef fer fes ffa ffc ffd ffe fff ffr ffs fra frc frd fre frf frr frs fsa fsc fsd fse fsf fsr fss ra- raa rac rad rae raf rar ras rca rcc rcd rce rcf rcr rcs rda rdc rdd rde rdf rdr rds re- rea rec red ree ref rer res rfa rfc rfd rfe rff rfr rfs rra rrc rrd rrf rrr rrs rsa rsc rsd rse rsf rsr rss saa sac sad sae saf sar sas sca scc scd sce scf scr scs sda sdc sdd sde sdf sdr sds se- sea sec sed see sef ser ses sfa sfc sfd sfe sff sfr sfs sr- sra src srd sre srf srr srs ss- ssa ssc ssd sse ssf ssr sss