Pāṇini sūtras

A Dvandva compound denoting a fixed number (etavatva) of concrete things (adhikarana) is not singular.

1. adhikaraṇa+etāvattveअधिकरण+एतावत्त्वे

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	adhikaraṇaअधिकरण	adhikaraṇaअधिकरण	substance	adhikaraṇअधिकरण् + plus aअ
   eए	etāvattvaएतावत्त्व	etāvattveएतावत्त्वे	measure	etāvattvएतावत्त्व् + plus eए

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

Anuvṛtti

1. ekavacanamएकवचनम् 2·4·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   eए	ekavacanaएकवचन	ekavacanamएकवचनम्	singular	ekavacanएकवचन् + plus amअम्

2. dvandvaḥद्वन्द्वः 2·4·2

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dvaṃdvaद्वंद्व	dvandvaḥद्वन्द्वः	DvaṃdvaDवंद्व	dvaṃdvद्वंद्व् + plus aḥअः

3. naन 2·4·14

   Part	Lexeme	Sandhi form	Meaning	Stem
   nन्	naन	naन	not	naन