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What is the grammatical profile of the form لَتَفْعَلِنَّ?

Conjugating Present Emphatic with Heavy Noon (Active & Passive)

• Singular Feminine Addressed Active (واحد مؤنث حاضر معروف)
• Singular Masculine Addressed Active (واحد مذکر حاضر معروف)
• Plural Feminine Addressed Active (جمع مؤنث حاضر معروف)
• Third-Person Singular Feminine Active (واحد مؤنث غائب معروف)