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What is the key added marker in اِبْرَنْشَقَ after Hamzat-ul-Wasl?

Derived Quadrilateral (with Hamzah) - Bab 2: If'inlaal & Bab 3: If'illaal

• A silent ن before the final root letter
• A doubled final root letter
• An internal Alif
• A prefixed Taa