The augment p is added after the vowel of a root pat 'to fall' in the Aorist aṅ,
As अपप्तत्, अपप्तताम्, अपप्तन् ॥ The पत् takes the अङ् Aorist as it has an indicatory ऋ in the Dhatupatha (III. I. 55).,
Adhyāya 7 · Pāda 4 · Rule 19
The augment p is added after the vowel of a root pat 'to fall' in the Aorist aṅ,
As अपप्तत्, अपप्तताम्, अपप्तन् ॥ The पत् takes the अङ् Aorist as it has an indicatory ऋ in the Dhatupatha (III. I. 55).,