Rule 2 concerns two hamzahs occurring in the same word when the second one is quiescent. The second hamzah must be replaced by the weak letter corresponding to the first hamzah's vowel.
Both conditions matter: the two hamzahs must belong to one word, and the second must be quiescent.
A first hamzah with fatḥah gives alif, with ḍammah gives wāw, and with kasrah gives yāʾ. Unlike the preceding optional rule, this is described as obligatory in the specified setting.
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Rule 2: Two Hamzahs in One Word
Rules of Hamzated Forms: Lightening, Substitution, Elision and Short Paradigms
Rule 2 concerns two hamzahs occurring in the same word when the second one is quiescent. The second hamzah must be replaced by the weak letter corresponding to the first hamzah's vowel.
Both conditions matter: the two hamzahs must belong to one word, and the second must be quiescent.
A first hamzah with fatḥah gives alif, with ḍammah gives wāw, and with kasrah gives yāʾ. Unlike the preceding optional rule, this is described as obligatory in the specified setting.