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The assimilation in ﴿أَثۡقَلَت دَّعَوَا﴾ is incomplete similarity assimilation

Similarity is a cause of assimilation, but not every similarity results in it.

Assimilation between similar letters occurs only across two words

The places of similarity assimilation in Ḥafṣ’s narration are only five

An example of similarity assimilation is: ﴿يَلۡهَثۚ ذَّٰلِكَ﴾.

The definition of similarity (tajānos) is:

A relationship between two letters that share the same articulation point but differ in attributes.
A relationship between two letters that share both articulation point and attributes.
A relationship between two letters that share attributes but differ in articulation point

Among the places where Ḥafṣ made complete similarity assimilation:

2. الصفات والعلاقات