zobia
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Re: Why there are lot of extra Alphabets in Urdu
I guess you never read Quran with Tajweed then. 
the one you pointed out “say, zaal, yay, Toen Zoen , Swaad Zwaad” they are delivered in a specific use of tongue, teeth and larynx.
if these words are not delievered properly, then they can change the entire meaning.