deriv SD cv (199) ashtadhyayi.com hei.de L 199 ETT STT a 6.1.68 ALPH OLDHOMEPAGE NEWHOMEPAGE

hal;Gy;Abbhyo dIrghAt su;ti;sy;apRktaM hal

हल्ङ्याब्भ्यो दीर्घात्सुॱतिॱस्यपृक्तं हल् ONPANINI 61068

(Erase) /su after consonants or long /GI /Ap,
and after consonants, (erase) /t''' /s'''.

The affix /su appears, because of GyApprAtipad..., after nounbases and /GI /Ap, and nowhere else. As in —

**vidyut- विद्युत् + /su by GyApprAtipad...
→ **vidyut' विद्युत्ऽ by this rule

**nadI- नदीॱ + /su by GyApprAtipad...
→ !**nadI नदी by this rule

**rAjJI- राज्ञीॱ f + /su by GyApprAtipad...
→ !**rAjJI राज्ञी by this rule

(See page delete su after consonants or long GI Ap for more examples.)

The /t''' /s''' mentioned in the sUtra are the /tiG affixes /tip and /sip. When they are right after a consonant, rule itazca turns them into /t''' /s''', and then this rule erases them. As in —

dviS द्विष् + /laG /tip
→ **adviS- अद्विष् + /tip
→ adveS- अद्वेष् + /tip by gbH
→ adveS- अद्वेष् + /t''' by itazca
→ adveS अद्वेष् by this rule
→ adveT अद्वेट् by jhalAJjazonte
→ **adveT अद्वेट् "he hated"

dviS द्विष् + /laG /sip
→ **adveT अद्वेट् "you' hated", same steps as above

han हन् + /laG /sip
→ **ahan'- अहन्ऽॱ + /sip
→ **ahan'- अहन्ऽॱ + /s'''
→ **ahan' अहन्ऽ "you killed" by this rule

(See page delete t s after consonants for more examples.)