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What is the clearest structural difference between قَاتَلَ and تَقَاتَلَ?

Derived Trilateral (without Hamzah) - Bab 5: Tafaa'ul (Taqatul)

• تَقَاتَلَ has an added initial تَـ
• قَاتَلَ has no Alif
• تَقَاتَلَ has a doubled middle root
• Both have identical structure