Shiva Purana
अकारादिषु वर्णेषु व्यापकं चोत्तरोत्तरम् ॥ व्याप्यन्त्वधस्तनं वर्णमेवं सर्वत्र भावयेत् ॥ २५ ॥
In the letters ‘A’ etc. the later one is pervasive of the earlier. The earlier one is the pervaded.
english translation
akArAdiSu varNeSu vyApakaM cottarottaram ॥ vyApyantvadhastanaM varNamevaM sarvatra bhAvayet ॥ 25 ॥
hk transliteration by Sanscript