Exclude the six throat letters for iẓhār, six yarmalūn letters for idghām, and bāʾ for qalb. The remaining fifteen are ت ث ج د ذ ز س ش ص ض ط ظ ف ق ك.
Do more than memorize the set: rehearse sākin nūn before each and listen for a concealed n-sound with ghunnah while preparing the next consonant.
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The fifteen ikhfāʾ letters
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
Exclude the six throat letters for iẓhār, six yarmalūn letters for idghām, and bāʾ for qalb. The remaining fifteen are ت ث ج د ذ ز س ش ص ض ط ظ ف ق ك.
Do more than memorize the set: rehearse sākin nūn before each and listen for a concealed n-sound with ghunnah while preparing the next consonant.