Use this order for two sākin letters. First: if both are in one word and the first is madd, it can be ʿalā ḥaddih. Second: for ghayr-ḥaddih with initial madd, drop the madd sound in liaison. Third: for an initial non-madd sākin, apply general kasrah or a stated special rule, such as ḍammah for plural mīm or fatḥah for «مِنْ».
For tanwīn also determine whether this is liaison or a stop and whether the next hamzah is a connecting hamzah.
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A three-part decision routine
Meeting of Two Sākin Letters — ʿAlā Ḥaddih, Ghayr Ḥaddih and Tanwīn
Use this order for two sākin letters. First: if both are in one word and the first is madd, it can be ʿalā ḥaddih. Second: for ghayr-ḥaddih with initial madd, drop the madd sound in liaison. Third: for an initial non-madd sākin, apply general kasrah or a stated special rule, such as ḍammah for plural mīm or fatḥah for «مِنْ».
For tanwīn also determine whether this is liaison or a stop and whether the next hamzah is a connecting hamzah.