Pāṇini sūtras

A Dvandva compound of words of different genders, denoting names of rivers and countries, but not of towns, is singular.

1. viśiṣṭa+liṅgaḥविशिष्ट+लिङ्गः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	viśiṣविशिष्	viśiṣṭaविशिष्ट	distinguish	viśiṣṭविशिष्ट् + plus aअ
   lल्	liṅgaलिङ्ग	liṅgaḥलिङ्गः	gender	liṅgलिङ्ग् + plus aḥअः

2. nadīनदी

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nadīनदी	nadīनदी	river	nadनद् + plus īई

3. deśaḥदेशः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	deśaदेश	deśaḥदेशः	location	deśदेश् + plus aḥअः

4. a+grāmāḥअ+ग्रामाः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   gग्	grāmaग्राम	grāmāḥग्रामाः	village	grāmग्राम् + plus āMआM

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