ʿAlā ḥaddih: first a madd sākin and both sākin elements within a word; permitted. Ghayr ḥaddih: resolved in connected reading, normally by omitting a madd sound or vowelizing the preceding non-madd sākin, with stated exceptions.
Tanwīn produces an audible nūn in liaison, takes kasrah before a following hamzat al-waṣl, and changes at a stop. كَأَيِّنْ has its particular written-nūn rule. The next section turns to madd and its kinds.
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Summary before the madd chapter
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
ʿAlā ḥaddih: first a madd sākin and both sākin elements within a word; permitted. Ghayr ḥaddih: resolved in connected reading, normally by omitting a madd sound or vowelizing the preceding non-madd sākin, with stated exceptions.
Tanwīn produces an audible nūn in liaison, takes kasrah before a following hamzat al-waṣl, and changes at a stop. كَأَيِّنْ has its particular written-nūn rule. The next section turns to madd and its kinds.