The Aramaic language had fewer phonemes than the Arabic, and some originally distinct Aramaic letters had become indistinguishable in shape, so that in the early writings 15 distinct letter-shapes had to do duty for 28 sounds; cf.
The monks transliterated the Arabic language using script.
Also, it is never correct to write a sukūn on that r, even though in actual pronunciation it is and in correct Arabic MUST be sukūned.
Adaptations of the for other languages added and removed some letters, as for example , , , , , in Iran , , , , , and , all of which have additional letters as shown below.
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How Many Words With Seven Letters are in the English Language? Here are a few examples.