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function CheckCollision(x1, y1, w1, h1, x2, y2, w2, h2)
   if x1 > (x2 + w2) or (x1 + w1) < x2 then return false end
   if y1 > (y2 + h2) or (y1 + h1) < y2 then return false end
   return true
end