Pāṇini sūtras

There is the single substitution of the first vowel, when a simple vowel is followed by the a of the case ending am

German Für einen einfachen Vocal und das a der Casusendung am wird der erste Vocal allein substituirt. (107)

1. amiअमि

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	amअम्	amiअमि	amअम्	amअम् + plus iइ

2. pūrvaḥपूर्वः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūrvaपूर्व	pūrvaḥपूर्वः	first	pūrvaपूर्व + plus ḥः

Anuvṛtti

1. saṃhitāyāmसंहितायाम् 6·1·72

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	saṃhitāसंहिता	saṃhitāyāmसंहितायाम्	continuous speech	saṃhitसंहित् + plus āyआय्

2. ya+ṇ+a+ciय+ण्+अ+चि 6·1·77

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	akāraअकार	aअ
   cच्	cच्	ciचि	CC	cच् + plus iइ

3. pūrva+parayoḥपूर्व+परयोः 6·1·84

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūrvaपूर्व	pūrvaपूर्व	antecedent	pūrvaपूर्व
   pप्	paraपर	parayoḥपरयोः	following	paraपर + plus yoḥयोः

4. a+kaḥअ+कः 6·1·101

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	akāraअकार	aअ
   kक्	kक्	kaḥकः	KK	kक् + plus aḥअः