The commentary also gives “100 and two garments.” Two garments are explicitly admitted, but the earlier hundred is still unspecified.
Changing garment to the dual form changes the number of conjoined garments; it does not, by itself, supply a unit for the preceding hundred.
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The commentary's two-garment example
Kitab al-Iqrar: Conjoined Amounts, Divine-Will Clauses, and Options
The commentary also gives “100 and two garments.” Two garments are explicitly admitted, but the earlier hundred is still unspecified.
Changing garment to the dual form changes the number of conjoined garments; it does not, by itself, supply a unit for the preceding hundred.