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I understand what the 1st and 3rd properties mean, and I have a question concerning the 2nd.

"The Adittion Property: The area of a region composed of several smaller regions that overlap in at most a line segment is the sum of areas of the smaller regions."

I don`t understand what that part in red means??

I don`t understand what "overlap" means, nor do I understand what "in at most a line segment" means?

Thanx in advance