كِتَابَاهُ — كِتَابَيْهِ
His two books: kitābāhu (nominative) and kitābayhi (accusative/genitive).
Both lose the nūn before the genitive attached pronoun.
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Dual Annexed to a Pronoun
The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah
كِتَابَاهُ — كِتَابَيْهِ
His two books: kitābāhu (nominative) and kitābayhi (accusative/genitive).
Both lose the nūn before the genitive attached pronoun.