Pāṇini sūtras

After a numeral, the first vowel of varṣa gets the Vṛiddhi, before a Taddhita affix having an indicatory ñ, ṇ or k, when the affix does not refer to a Future time.

1. varṣasyaवर्षस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	varṣaवर्ष	varṣasyaवर्षस्य	varṣa [word]वर्ष [wओर्द्]	varṣवर्ष् + plus asyaअस्य

2. a+bhaviṣyatiअ+भविष्यति

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   bब्	bhaviṣyatभविष्यत्	bhaviṣyatiभविष्यति	future(a)	bhaviṣyभविष्य् + plus atiअति

Anuvṛtti

1. uttara+padasyaउत्तर+पदस्य 7·3·10

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   uउ	uttaraउत्तर	uttaraउत्तर	following	uttarउत्तर् + plus aअ
   pप्	padaपद	padasyaपदस्य	word	padपद् + plus asyaअस्य

2. saṅkhyāyāḥसङ्ख्यायाः 7·3·15

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃkhyāसंख्या	saṅkhyāyāḥसङ्ख्यायाः	numeral	saṃkhyसंख्य् + plus āyआय्