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What is the exact middle root letter (Ayn-letter) vowel configuration for Bab Nasara in past and present?

Trilateral Bare Regular - Bab 1: Nasara Yansuru (Sarf Sagheer)

• Kasrah in past, Fathah in present
• Fathah in past, Dhummah in present
• Fathah in both past and present
• Dhummah in both past and present