In the cited poetic example, rhyme-final al-ʿitāban and aṣāban illustrate the special nūn of tarannum, not an ordinary accusative marker or normal verb ending.
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The Source’s Rhyme Example
Tanwīn: Five Types, Their Function, and Omission
In the cited poetic example, rhyme-final al-ʿitāban and aṣāban illustrate the special nūn of tarannum, not an ordinary accusative marker or normal verb ending.