وَمَكْسُورَةٌ إِنْ كَانَ قَبْلَهَا أَلِفٌ.
Translation: If an alif precedes it, the heavy nūn has kasra.
After an alif the heavy nūn is kasra-marked, e.g. iḍribānni addressed to two persons.
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When Heavy Nūn Has Kasra
The Two Emphatic Nūns: Forms and Rules
وَمَكْسُورَةٌ إِنْ كَانَ قَبْلَهَا أَلِفٌ.
Translation: If an alif precedes it, the heavy nūn has kasra.
After an alif the heavy nūn is kasra-marked, e.g. iḍribānni addressed to two persons.