Quite possibly coronary artery disease.
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2D CAD = two dimensional computer aided drafting. 2D CAD is like drafting on paper on a drafting board. 2D CAD is a old way of doing CAD. Nowdays, The new way is three dimensional CAD.
The mean, or the average.
That's the definition of the "mean" or "average" of that group of terms.
The arithmetic mean.
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