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What is the correct standard imperative (command) form for the verb اِقْشَعَرَّ?

Derived Quadrilateral (with Hamzah) - Bab 2: If'inlaal & Bab 3: If'illaal

• اِقْشَعِرَّ (ends in Fathah on the doubled letter)
• اِقْشَعِرْ
• لَا تَقْشَعِرَّ
• مُقْشَعِرٌّ