deriv SD cv (558) ashtadhyayi.com hei.de L 558 ETT STT a 3.4.107 ALPH OLDHOMEPAGE NEWHOMEPAGE

suT tithoH सुट्तिथोः ONPANINI 34107

t त् and th थ् get /suT (when part of a substitute of the /Atmanepada soft /liG endings).

So, in the bent soft liG, we have one s स् in sI सी from <<<<< liGassIyuT, and this rule replaces t त् th थ् with st स्त् sth स्थ् inside of /ta /AtAm /thAs /AthAm, and we get **sISTa सीष्ट **sIyAstAm सीयास्ताम् **sISThAs सीष्ठास् **sIyAsthAm सीयास्थाम् —

labh लभ् + soft liG /ta
→ labh लभ् + sta स्त by this rule
→ labh लभ् + **sISTa सीष्ट
→ **lapsISTa लप्सीष्ट

Why do you say "/Atmanepada" and soft, u cheater? The original sUtra says that the hard liG gets that s स् too. And so does the flat soft liG.

Uh. You are right, I lied. This is the TRUE translation of the sUtra —

t त् and th थ् get /suT (when part of a substitute of /liG).

However, in the cases you mention, after this /pANini rule adds s स्, some other rule ends up deleting it. So I thought you might as well not add it. Just to save trouble.