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What are the exact extra letters added to the root to construct the past active اِجْتَنَبَ?

Derived Trilateral (with Hamzah) - Bab 1: Ifti'aal (Ijtinab)

• Prefix Hamzah and post-Fa letter Taa
• Prefix Meem and post-Ayn letter Waw
• Prefix Seen and Taa
• None of the letters are extra