a-a a-c aaa aac aad aae aah ac- aca acc acd ace ach ad- ada adc add ade adh aea aec aed aee aeh aha ahc ahd ahe ahh c-- caa cac cad cae cah cca ccc ccd cce cch cda cdc cdd cde cdh ce- cea cec ced cee ceh ch- cha chc chd che chh daa dac dad dae dah dca dcc dcd dce dda ddc ddd dde ddh de- dea dec ded dee deh dh- dha dhc dhd dhe dhh eaa eac ead eae eah ec- eca ecc ecd ece ech ed- eda edc edd ede edh eea eec eed eee eha ehc ehd ehe ehh haa hac had hae hah hca hcc hcd hce hch hda hdc hdd hde hdh he- hea hec hed hee heh hha hhc hhd hhe hhh