Start from the earlier Mulhaq form قَلْنَسَ.
This form already contains an inserted نْ between the second and third root letters.
Bab 2 adds تَـ at the beginning:
قَلْنَسَ → تَقَلْنَسَ.
Its Masdar is تَقَلْنُسٌ, meaning to wear a cap.
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Bab 2: Taqalnasa
Attached Derived Quadrilateral - Bab 1: Tafa'lul & Bab 2: Tafa'lul & Bab 3: Tamaf'ul
Start from the earlier Mulhaq form قَلْنَسَ.
This form already contains an inserted نْ between the second and third root letters.
Bab 2 adds تَـ at the beginning:
قَلْنَسَ → تَقَلْنَسَ.
Its Masdar is تَقَلْنُسٌ, meaning to wear a cap.