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Which two features identify Bab Tafa''ul?

Derived Trilateral (without Hamzah) - Bab 3: Tafa''ul (Taqabbul)

• Prefixed تَـ and Shaddah on the middle root letter
• Prefixed Hamzah and silent Noon
• Prefixed Meem and internal Alif
• Only a doubled final root letter