a-a a-c aaa aac aad aah aao ac- aca acc acd ach aco ad- ada adc add adh ado aha ahc ahd ahh aho aoa aoc aod aoh aoo c-- caa cac cad cah cao cca ccc ccd cch cco cda cdc cdd cdh cdo ch- cha chc chd chh cho co- coa coc cod coh coo daa dac dad dah dao dca dcc dcd dco dda ddc ddd ddh ddo dh- dha dhc dhd dhh dho doa doc dod doh doo haa hac had hah hao hca hcc hcd hch hco hda hdc hdd hdh hdo hha hhc hhd hhh hho hoa hoc hod hoh hoo oaa oac oad oah oao oc- oca occ ocd och oco oda odc odd odh odo oha ohc ohd ohh oho oo- ooa ooc ood ooh ooo