بَعْلَبَكّ is diptote: ḍamma in the nominative, fatḥa in the accusative and the ordinary genitive. Its ending can change.
شَابَ قَرْنَاهَا is an isnādī compound described by the book as mabnī: its internal clause is preserved as a name.
A diptote is not the same as indeclinable; it still exhibits case inflection, albeit with special forms.
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Diptote Causes — Compounding and Its Conditions
بَعْلَبَكّ is diptote: ḍamma in the nominative, fatḥa in the accusative and the ordinary genitive. Its ending can change.
شَابَ قَرْنَاهَا is an isnādī compound described by the book as mabnī: its internal clause is preserved as a name.
A diptote is not the same as indeclinable; it still exhibits case inflection, albeit with special forms.