The long ā is optionally substituted for the final of tan before the Passive characteristic yak,
Thus तायते or तन्यते; but no option is allowed in तन्तन्यते with यङ् ॥,
तनोतेर्यकि
Adhyāya 6 · Pāda 4 · Rule 44
Adhyāya 6 · Pāda 4 · Rule 44
The long ā is optionally substituted for the final of tan before the Passive characteristic yak,
Thus तायते or तन्यते; but no option is allowed in तन्तन्यते with यङ् ॥,