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What is the basic pattern of Bab Istif'aal?

Derived Trilateral (with Hamzah) - Bab 2: Istif'aal (Istinsar)

• اِسْتَفْعَلَ
• اِفْتَعَلَ
• تَفَعَّلَ
• اَفْعَلَ