deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
Rule yAsuTparasm... adds yAs in front of these, making them into yAst , yAstAm , yAss , yAsus , yAss etc. Then, rule suTtithoH adds some extra s to some. In the hard liG all s where deleted by liGassalop..., but here, liGassalop... does not work, so that the s of yAs stays, and the sandhi rule skossaMyogAdy... deletes the s from suTti , and the first s of yAss and yAst .
Soft:
dviS + **yAt' → **dviSyAt' "may he hate", not same as **dviSyAt
dviS + **yAs' → !**dviSyAs'
dviS + **yAsam → !**dviSyAsam
Hard:
dviS + **yAs → !**dviSyAs
dviS + **yAm → !**dviSyAm
See also some parasmaipada liG verbs.
Why don't **dviSyAt' **dviSyAt etc. get gbS or gbH, not even before hard /tip /sip /mip?
Because rule yAsuTparasm... makes them /Git, and that makes kGitica debar /guNa.