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What are the exact three prefixed extra letters added to the root نَصَرَ to form اِسْتَنْصَرَ?

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

• Prefix Hamzah, Seen, and Taa (اِسْتَـ)
• Prefix Meem and post-Ayn letter Waw
• Prefix Hamzah and post-Fa letter Taa
• No extra letters are added