لَيَكْتُبَنَّ
Nūn al-tawkīd intensifies a verb and is not the indicative nūn of the five verbs. Direct emphatic-nūn attachment is a separate building rule.
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Emphatic Nūn Is Different
Four Patterns of Imperfect Mood Marking
لَيَكْتُبَنَّ
Nūn al-tawkīd intensifies a verb and is not the indicative nūn of the five verbs. Direct emphatic-nūn attachment is a separate building rule.