Is It a Equilateral Triangle

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You are given with the integer co-ordinates of 3 points in $X$ - $Y$ Plane. Find if they form a Equilateral Triangle. You can Find What a Equilateral Triangle is [here](https://en.wikipedia.org/wiki/Equilateral_triangle) . Formally you will be given with $x-y$ co-ordinates of 3 points and you have to print "yes" (without quotes) if they form an equilateral triangle else "no"(without quotes).

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solution.cppC++17

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