deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
Before a अ,
as अस् + a अ → o ओ
by sasajuSoruH, atororapl..., AdguNaH, eGaHpadAnt...
as in **azvotra अश्वोत्र
Before other vowels,
as अस् → ay अय् OR a:: अ
by sasajuSoruH, bhobhagoagh..., and optionally lopazzAkaly...
as in **arjunayuvAca अर्जुनयुवाच and **arjuna::uvAca अर्जुनउवाच
Before /haz,
as अस् → o
by sasajuSoruH, hazica, AdguNaH
as in **azvodravati अश्वोद्रवति
As we have covered the /haz and the vowels, this leaves out /khar letters and pause. Before these, sasaju ससजु changes s स् into /ru, and that /ru behaves like a normal r र्. See changes of wordfinal r.