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What is the Masdar of سَرْوَلَ?

Attached Trilateral (Mujarrad) - Bab 3: Faw'alah & Bab 4: Fa'walah

• سَرْوَلَةٌ
• جَوْرَبَةٌ
• سِرْوَالٌ
• مُسَرْوِلٌ