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What does the form لَا نُفْعَلَنَّ represent semantically?

Conjugating the Prohibitive with Heavy Noon (Active & Passive)

• non-singular first-person passive prohibition with emphasis (generic ف ع ل template) — جمع متکلم مجہول
• Let us not do (with emphasis) — جمع متکلم معروف
• We do not do (with emphasis) — جمع متکلم نفی
• first-person singular passive prohibition (generic ف ع ل template) (with emphasis) — واحد متکلم مجہول