رَ and رُ are read with a full, heavy mouth. رِ is read with an empty, light mouth.
رْ follows the letter before it: full after a زَبَر or پِيْش, empty after a زِيْر.
In the five words marked *, رْ is read with a full mouth: a heavy letter (حُرُوْفِ مُسْتَعْلِيَه) comes after it, or the زِيْر before it is in another word.
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