a-a a-c aaa aac aad aaf aah aao aar ac- aca acc acd acf ach aco acr ad- ada adc add adf adh ado adr af- afa afc afd aff afh afo afr aha ahc ahd ahf ahh aho ahr aoa aoc aod aof aoh aoo aor ar- ara arc ard arf arh aro arr c-- caa cac cad caf cah cao car cca ccc ccd ccf cch cco ccr cda cdc cdd cdf cdh cdo cdr cfa cfc cfd cff cfh cfo cfr ch- cha chc chd chf chh cho chr co- coa coc cod cof coh coo cor cra crc crd crf crh cro crr daa dac dad daf dah dao dar dca dcc dcd dcf dco dcr dda ddc ddd ddf ddh ddo ddr dfa dfc dfd dff dfh dfo dfr dh- dha dhc dhd dhf dhh dho dhr doa doc dod dof doh doo dor dra drc drd dro drr faa fac fad faf fah fao far fca fcc fcd fcf fco fcr fda fdc fdd fdf fdh fdo fdr ffa ffc ffd fff ffh ffo ffr fha fhc fhf fhh fho fhr foa foc fof foh foo for fra frc frd frf frh fro frr haa hac had haf hah hao har hca hcc hcd hcf hch hco hcr hda hdc hdd hdf hdh hdo hdr hfa hfc hfd hff hfh hfo hfr hha hhc hhd hhf hhh hho hhr hoa hoc hod hof hoh hoo hor hr- hra hrc hrd hrf hrh hro hrr oaa oac oad oaf oah oao oar oc- oca occ ocd ocf och oco ocr oda odc odd odf odh odo odr of- ofa ofc ofd off ofo ofr oha ohc ohd ohf ohh oho ohr oo- ooa ooc ood oof ooh ooo oor or- ora orc ord orf orh oro orr ra- raa rac rad raf rah rao rar rca rcc rcd rcf rch rco rcr rda rdc rdd rdf rdh rdo rdr rfa rfc rfd rff rfh rfo rfr rh- rha rhc rhd rhf rhh rho rhr roa roc rod rof roh roo ror rra rrc rrd rrf rrh rrr