 Only four letters are x @-@ height , with neither ascenders nor descenders : ა , თ , ი , ო . 
 Only four letters <a href='drop_aux' title='1'><mark>are</mark></a>x @-@ height , with neither ascenders nor descenders : ა , თ , ი , ო . 
Only four letters x @-@ height , with neither ascenders nor descenders : ა , თ , ი , ო .