deriv SD cv (1297) ashtadhyayi.com hei.de L 1297 ETT STT a 5.3.6 ALPH OLDHOMEPAGE NEWHOMEPAGE

sarvasya so 'nyatarasyAn di

सर्वस्य सो ऽन्यतरस्यां दि ONPANINI 53006

Optionally replace /sarva- with sa- सॱ before /dA.

/sarva- + /dA → !**sadA सदा "always"

ITA —

/sarva- + /dA → !**sarvadA सर्वदा "always"

The sUtra says "before /prAgdizIya affixes beginning with d द्". Why do you translate "before /dA"?

Because, AFAIK, /dA is the only such affix. Maybe I'm wrong.