Pāṇini sūtras

There is optionally the vocalisation of śyā followed by the Nishṭhâ affixes, when the upasargas abhi and ava precede it.

German Freigestellt ist die Vocalisation in śyā nach abhi und ava vor den genannten Suffixen. (26)

1. vibhāṣā+abhi+ava+pūrvasyaविभाषा+अभि+अव+पूर्वस्य

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   vव्	vibhāṣविभाष्	vibhāṣāविभाषा	option	vibhāṣविभाष् + plus āआ
   aअ	abhiअभि	abhiअभि	abhiअभि	abhअभ् + plus iइ
   aअ	avaअव	avaअव	avaअव	avअव् + plus aअ
   pप्	pūrvaपूर्व	pūrvasyaपूर्वस्य	antecedent	pūrvaपूर्व + plus syaस्य

Anuvṛtti

1. samprasāraṇamसम्प्रसारणम् 6·1·13

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	samprasārȧसम्प्रसार̇	samprasāraṇamसम्प्रसारणम्	samprasāraṇaसम्प्रसारण	samprasāraṇसम्प्रसारण् + plus amअम्

2. niṣṭhāyāmनिष्ठायाम् 6·1·22

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	niṣṭhनिष्ठ्	niṣṭhāyāmनिष्ठायाम्	niṣṭhāनिष्ठा	niṣṭhनिष्ठ् + plus āyआय्

3. śyaḥश्यः 6·1·24

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   śश्	śyāश्या	śyaḥश्यः	śyāश्या	śyश्य् + plus aḥअः