Yaktubāni carries nūn of indicative mood in the five-verbs paradigm; uktubānni ends in heavy emphatic nūn.
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Distinguish the Mood-Ending Nūn
The Two Emphatic Nūns: Forms and Rules
Yaktubāni carries nūn of indicative mood in the five-verbs paradigm; uktubānni ends in heavy emphatic nūn.