When the dual is formed, the final ya appears before the dual ending.
بَاقٍ → بَاقِيَانِ
قَاضٍ → قَاضِيَانِ
هَادٍ → هَادِيَانِ
دَاعٍ → دَاعِيَانِ
The ya omitted in the indefinite nominative or genitive form reappears before انِ in the dual.
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Dual: The Ya Returns
Ism Manqus: Case, Dual and Sound Plurals
When the dual is formed, the final ya appears before the dual ending.
بَاقٍ → بَاقِيَانِ
قَاضٍ → قَاضِيَانِ
هَادٍ → هَادِيَانِ
دَاعٍ → دَاعِيَانِ
The ya omitted in the indefinite nominative or genitive form reappears before انِ in the dual.