اِثْنَانِ اِثْنَانِ → مَثْنَىٰ means “2 at a time.”
ثَلَاثَةٌ ثَلَاثَةٌ → ثُلَاثُ means “3 at a time.”
أَرْبَعَةٌ أَرْبَعَةٌ → رُبَاعُ means “4 at a time.”
The shorter forms do not merely name the numbers; they express distribution.
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Actual Transformation in Distributive Numbers
Cause of Ghayr Munsarif: Transformation (Adl)
اِثْنَانِ اِثْنَانِ → مَثْنَىٰ means “2 at a time.”
ثَلَاثَةٌ ثَلَاثَةٌ → ثُلَاثُ means “3 at a time.”
أَرْبَعَةٌ أَرْبَعَةٌ → رُبَاعُ means “4 at a time.”
The shorter forms do not merely name the numbers; they express distribution.