A visible hamzah does not always arise through the same rule.
صَحَائِفُ
Translation: Documents; hamzah from a long-vowel element in a plural pattern.
أُجُوهٌ
Translation: Faces; optionally substituted initial wāw.
أَوَاصِلُ
Translation: Plural of wāṣil; obligatory replacement of the first of two initial wāws.
The same written letter may reflect quite different positions, conditions and degrees of obligation.
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Three Sources of a Visible Hamzah
Miscellaneous Morphological Explanations: Eight Rules for Wāw, Yāʾ, Alif and Hamzah
A visible hamzah does not always arise through the same rule.
صَحَائِفُ
Translation: Documents; hamzah from a long-vowel element in a plural pattern.
أُجُوهٌ
Translation: Faces; optionally substituted initial wāw.
أَوَاصِلُ
Translation: Plural of wāṣil; obligatory replacement of the first of two initial wāws.
The same written letter may reflect quite different positions, conditions and degrees of obligation.