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Plz ans this

AsalamuAlaykum,

I've done a lot of research over the seven Ahruf of the Quran. But I've come across a lot of difference of opinion. Are they different dialects of the Quran? Did Uthman RA preserve all the ahruf or just one harf? How can he incorporate all the ahruf in one Quran?..in that way wouldn't it be kind of life a new mushaf different from any of that before? The Quran that is present today... it's one, but some say there are different mushafs due to which differences in recitation arose. What is the Quran present today..does various copies have differences in words/letters etc? Also how can we prove that the Quran that Uthman RA compiled and copied was the same at the time of Prophet Muhammad SAW, considering if he preserved all the ahruf?

JazakAllah Khair. Plz answer as soon as possible.