Grammatical Sūtra: ग्रीष्मवसन्तादन्यतरस्याम् grīṣmavasantādanyatarasyām 
Individual Word Components: grīṣmavasantāt anyatarasyām
Sūtra with anuvṛtti words: grīṣmavasantāt anyatarasyām pratyayaḥ (3.1.1), paraḥ (3.1.2), ca (3.1.2), ādyudāttaḥ (3.1.3), ca (3.1.3), ṅyāpprātipadikāt (4.1.1), taddhitāḥ (4.1.76), samarthānām (4.1.82), prathamāt (4.1.82), vā (4.1.82), aṇ (4.1.83), strīpuṁsābhyām (4.1.87), nañsnañau (4.1.87), bhavanāt (4.1.87), tatra (4.3.25), kālāt (4.3.43), upte (4.3.44)
Type of Rule: vidhi
Preceding adhikāra rule:4.2.92 (1śeṣe)
Description:
The affix ((vuñ)) comes optionally after the words 'grûshma' and 'vasanta', in the sense of' sown'. Source: Aṣṭādhyāyī 2.0
[The taddhitá 1.76 affix 3.1.1 vuÑ 45] is optionally (anya-tará-syām) introduced [after 3.1.2 the nominal stems 1.1] grīṣmá- `summer' and vasantá- `spring' [ending in 1.1.72 the seventh sUP triplet 25 to denote `sown' 44 at that time 25]. Source: From Aṣṭādhyāyī of Pāṇini In Roman Transliteration translated by Sumitra M. Katre, Copyright © 1987. Courtesy of the University of Texas Press.