Original sentence: Hence in the form of the word without a prefix the the first vowel <a> is deleted because it is in a Weak syllable; in the form with the person prefix the same vowel is in a Strong syllable and is not deleted
Edited sentence: Hence in the form of the word without a prefix the first vowel <a> is deleted because it is in a Weak syllable; in the form with the person prefix the same vowel is in a Strong syllable and is not deleted