تَكْتُبُونَ ← اُكْتُبُوا
Taktubūna → uktubū. The plural subject wāw remains while the inflectional nūn disappears; final separating alif is orthographic, not a building sign.
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Masculine Plural: Nūn Deletion
The Imperative: Definition, Formation, Hamza, and Building Signs
تَكْتُبُونَ ← اُكْتُبُوا
Taktubūna → uktubū. The plural subject wāw remains while the inflectional nūn disappears; final separating alif is orthographic, not a building sign.