-er a-a a-c aaa aac aad aae aao aar aas ac- aca acc acd ace aco acr acs ad- ada adc add ade ado adr ads aea aec aed aee aeo aer aes aoa aoc aod aoe aoo aor aos ar- ara arc ard are aro arr ars as- asa asc asd ase aso asr ass c-- caa cac cad cae cao car cas cca ccc ccd cce cco ccr ccs cda cdc cdd cde cdo cdr cds ce- cea cec ced cee ceo cer ces co- coa coc cod coe coo cor cos cra crc crd cre cro crr crs csa csc csd cse cso csr css daa dac dad dae dao dar das dca dcc dcd dce dco dcr dcs dda ddc ddd dde ddo ddr dds de- dea dec ded dee deo der des doa doc dod doe doo dor dos dra drc drd dre dro drr drs dsa dsc dsd dse dso dsr dss eaa eac ead eae eao ear eas ec- eca ecc ecd ece eco ecr ecs ed- eda edc edd ede edo edr eds eea eec eed eee eeo eer ees eo- eoa eoc eod eoe eoo eor eos era erc erd ere ero err ers es- esa esc esd ese eso esr ess oaa oac oad oae oao oar oas oc- oca occ ocd oco ocr ocs oda odc odd ode odo odr ods oea oec oed oee oeo oer oes oo- ooa ooc ood ooo oor oos or- ora orc ord ore oro orr ors os- osa osc osd ose oso osr oss ra- raa rac rad rae rao rar ras rca rcc rcd rce rco rcr rcs rda rdc rdd rde rdo rdr rds re- rea rec red ree reo rer res roa roc rod roe roo ror ros rra rrc rrd rrr rrs rsa rsc rsd rse rso rsr rss saa sac sad sae sao sar sas sca scc scd sce sco scr scs sda sdc sdd sde sdo sdr sds se- sea sec sed see seo ser ses soa soc sod soe soo sor sos sr- sra src srd sre sro srr srs ss- ssa ssc ssd sse sso ssr sss