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, then a word signifying a point of the compass or a number, enters into composition with a case-inflected word which is in agreement with it by being in the same case, and the compound so formed is called Tat-purusha.

1. taddhita+artha+uttara+pada+samāhāreतद्धित+अर्थ+उत्तर+पद+समाहारे

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   tत्	taddhitaतद्धित	taddhitaतद्धित	taddhitaतद्धित	taddhitतद्धित् + plus aअ
   aअ	arthaअर्थ	arthaअर्थ	meaning	arthअर्थ् + plus aअ
   uउ	uttaraउत्तर	uttaraउत्तर	following	uttarउत्तर् + plus aअ
   pप्	padaपद	padaपद	word	padपद् + plus aअ
   sस्	samāhāraसमाहार	samāhāreसमाहारे	group	samāhārसमाहार् + plus eए

2. caच

   Part	Lexeme	Sandhi form	Meaning	Stem
   cच्	caच	caच	besides	caच

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

2. diś+saṅkhyeदिश्+सङ्ख्ये 2·1·50

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   dद्	diśदिश्	diśदिश्	direction	diśदिश्
   sस्	saṃkhyāसंख्या	saṅkhyeसङ्ख्ये	number	saṃkhyसंख्य् + plus eए