a-a aaa aad aae aaf aak ad- ada add ade adf adk aea aed aee aef aek af- afa afd afe aff afk aka akd ake akk daa dad dae daf dak dda ddd dde ddf ddk de- dea ded dee def dek dfa dfd dfe dff dfk dka dke dkk eaa ead eae eaf eak ed- eda edd ede edf edk eea eed eee eef eek ef- efa efd efe eff eka ekd eke ekf faa fad fae faf fak fda fdd fde fdf fdk fea fed fee fef fek ffa ffd ffe fff ffk fka fkf fkk ka- kaa kad kae kaf kak kda kde kdf kdk ke- kea ked kee kef kek kfa kfd kff kke kkk