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What is the original form of the past active verb قَلْسَىٰ According to the rule?

Attached Trilateral (Mujarrad) - Bab 7: Fa'laah & Weak Root Rules

• قَلْسَيَ
• قَلْسَوَ
• قَلْسَاتٌ
• قَلْسَنَ