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https://khaledfahmy.org/ar/2017/10/17/%d8%ab%d9%88%d8%a7%d8%a8%d8%aa-%d9%88%d8%ad%d9%82%d9%88%d9%82-%d9%88%d9%82%d9%88%d8%b3-%d9%82%d8%b2%d8%ad/
ثوابت وحقوق وقوس قزح