Compare four pairs. أَمْ مَنْ: m + m = idghām. هُمْ بِمُؤْمِنِينَ: m + b = ikhfāʾ (remember the author’s qualified discussion). عَلَيْهِمْ وَلَا: m + w = iẓhār. كَيْدَهُمْ فِي: m + f = iẓhār.
Do not assign one rule to all letters pronounced near the lips. The particular next letter, not proximity alone, decides the classification.
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A practical contrast of four pairs
Compare four pairs. أَمْ مَنْ: m + m = idghām. هُمْ بِمُؤْمِنِينَ: m + b = ikhfāʾ (remember the author’s qualified discussion). عَلَيْهِمْ وَلَا: m + w = iẓhār. كَيْدَهُمْ فِي: m + f = iẓhār.
Do not assign one rule to all letters pronounced near the lips. The particular next letter, not proximity alone, decides the classification.