Pāṇini sūtras

In a case where the sense is that of a taddhita affix, or when an additional member comes after the compound or when an aggregate is to be expressed, the compound, the first member of which is numeral, is called Dvigu or Numeral Determinative compound.

1. saṅkhyā+pūrvaḥसङ्ख्या+पूर्वः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃkhyāसंख्या	saṅkhyāसङ्ख्या	numeral	saṃkhyसंख्य् + plus āआ
   pप्	pūrvaपूर्व	pūrvaḥपूर्वः	first	pūrvaपूर्व + plus ḥः

2. dviguḥद्विगुः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	dviguद्विगु	dviguḥद्विगुः	dviguद्विगु	dvigद्विग् + plus uḥउः

Anuvṛtti

1. samāna+adhikaraṇenaसमान+अधिकरणेन 2·1·49

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	samānaसमान	samānaसमान	identical	samānसमान् + plus aअ
   aअ	adhikaraṇaअधिकरण	adhikaraṇenaअधिकरणेन	reference	adhikaraṇअधिकरण् + plus enaएन