وَقَدْ يُحْذَفُ مِنَ الْعَلَمِ إِذَا كَانَ مَوْصُوفًا بِابْنٍ مُضَافًا إِلَى عَلَمٍ
Translation: Tanwīn can be omitted from a proper name qualified by ibn, which is annexed to another proper name.
Tanwīn is omitted from a declinable proper name when an immediately following ibn acts as its qualifying description and is annexed to another proper name.
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Omission before Qualifying Ibn
Tanwīn: Five Types, Their Function, and Omission
وَقَدْ يُحْذَفُ مِنَ الْعَلَمِ إِذَا كَانَ مَوْصُوفًا بِابْنٍ مُضَافًا إِلَى عَلَمٍ
Translation: Tanwīn can be omitted from a proper name qualified by ibn, which is annexed to another proper name.
Tanwīn is omitted from a declinable proper name when an immediately following ibn acts as its qualifying description and is annexed to another proper name.