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sadir aprateH

सदिरप्रतेः ONPANINI 83066

The root sad सद् gets /Satvam change after an /upasarga ending in i इ u उ, except after /prati.

niSIdati viSIdati निषीदति विषीदति

nyaSIdat vyaSIdat न्यषीदत्व्यषीदत्

niSasAda viSasAda निषसाद विषसाद — the second s स् stays, by sadeHparasy...

But not after /prati —

pratisIdati प्रतिसीदति "abhors", "sits away from"

And not after /pra, wich does not end in i इ u उ :

prasIdati प्रसीदति "becomes settled, calms down".