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अव्यक्तानुकरणस्यात‌ इतौ ONPANINI 61098

at अत् of an onomatopoeia merges with /iti into the latter.

paTat पटत् + /iti
→ paT पट् + i इ + ti ति
→ paTiti पटिति, debarring *paTaditi पटदिति

paTat पटत् + /iti
→ paTat पटत् + paTat पटत् + /iti when meaning repetition by nityavIpsayoH
→ paTatpaTiti पटत्पटिति

Then how do you explain away the ghaTaditi घटदिति in the following sentence?

ghaTad iti gambhIram ambudair naditam |
घटदिति गम्भीरमम्बुदैर्नदितम्।
'the clouds made a deep "ghaTat घटत्" sound'

Easy. That word is ghaTad घटद्, not ghaTat घटत्.

Hmmm. Then this sUtra is optional.