I love parallelograms. How about you? - Correct version

Geometry Level 2

I place 2 points (in pink) inside a parallelogram, and then draw a line segment from each point to each of the 4 vertices of this parallelogram, dividing it into 9 parts.

If the four triangles in the diagram have areas 13, 15, 18, and 19, respectively, what is the area of the blue quadrilateral?

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