Use this order:
1. Identify the number of original root letters: 3 or 4.
2. Check whether any extra letters have been added.
If the answer is 3 + no extra letters, the class is Thulaathi Mujarrad.
If the answer is 4 + no extra letters, the class is Rubaa'i Mujarrad.
The same method identifies the two Mazeed Feeh classes when extra letters are present.
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A Two-Step Classification Method
Introduction to Verb Scales (Abwab): Trilateral & Quadrilateral
Use this order:
1. Identify the number of original root letters: 3 or 4.
2. Check whether any extra letters have been added.
If the answer is 3 + no extra letters, the class is Thulaathi Mujarrad.
If the answer is 4 + no extra letters, the class is Rubaa'i Mujarrad.
The same method identifies the two Mazeed Feeh classes when extra letters are present.