a-a a-c aaa aac aad aaf aao aar aas ac- aca acc acd acf aco acr acs ad- ada adc add adf ado adr ads af- afa afc afd aff afo afr afs aoa aoc aod aof aoo aor aos ar- ara arc ard arf aro arr ars as- asa asc asd asf aso asr ass c-- caa cac cad caf cao car cas cca ccc ccd ccf cco ccr ccs cda cdc cdd cdf cdo cdr cds cfa cfc cfd cff cfo cfr cfs co- coa coc cod cof coo cor cos cra crc crd crf cro crr crs csa csc csd csf cso csr css daa dac dad daf dao dar das dca dcc dcd dcf dco dcr dcs dda ddc ddd ddf ddo ddr dds dfa dfc dfd dff dfo dfr dfs doa doc dod dof doo dor dos dra drc drd dro drr drs dsa dsc dsd dsf dso dsr dss faa fac fad faf fao far fas fca fcc fcd fcf fco fcr fcs fda fdc fdd fdf fdo fdr fds ffa ffc ffd fff ffo ffr ffs foa foc fof foo for fos fra frc frd frf fro frr frs fsa fsc fsd fsf fso fsr fss oaa oac oad oaf oao oar oas oc- oca occ ocd ocf oco ocr ocs oda odc odd odf odo odr ods of- ofa ofc ofd off ofo ofr ofs oo- ooa ooc ood oof ooo oor oos or- ora orc ord orf oro orr ors os- osa osc osd osf oso osr oss ra- raa rac rad raf rao rar ras rca rcc rcd rcf rco rcr rcs rda rdc rdd rdf rdo rdr rds rfa rfc rfd rff rfo rfr rfs roa roc rod rof roo ror ros rra rrc rrd rrf rrr rrs rsa rsc rsd rsf rso rsr rss saa sac sad saf sao sar sas sca scc scd scf sco scr scs sda sdc sdd sdf sdo sdr sds sfa sfc sfd sff sfo sfr sfs soa soc sod sof soo sor sos sr- sra src srd srf sro srr srs ss- ssa ssc ssd ssf sso ssr sss