«العرفية الخاصة: وهي العرفية العامة مع قيد اللادوام بحسب الذات»
The special customary joins the general customary mode to non-permanence with respect to the subject itself.
The general customary mode involves permanence while the descriptive title applies; the general conditional involves necessity under that same title.
Both special constructions add “not permanently,” but they start differently:
Special conditional — necessity while the description holds.
Special customary — continuity while the description holds.
The distinction lies in the force of their first components, not in the final qualification.