Ḥasuna is triliteral and can directly yield mā aḥsana. Ijtahada is derived, so standard direct formation is avoided; use an auxiliary exclamation plus maṣdar.
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Condition 1: Triliteral Basis
The Two Exclamatory Verbs: Forms, Rules and Parsing
Ḥasuna is triliteral and can directly yield mā aḥsana. Ijtahada is derived, so standard direct formation is avoided; use an auxiliary exclamation plus maṣdar.