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What does the morphological term "Mulhaq" (ملحق) mean in the book?

Attached Trilateral (Mujarrad) - Bab 1: Fa'lalah & Bab 2: Fa'nalah

• Verbs derived by adding connecting Hamzah
• Trilateral verbs attached to quadrilateral patterns
• Non-conjugatable verbs
• Verbs with exactly three letters only