A rectangle is a shape with four sides, and four right-angled corners.
A square is with four sides of equal length, and four right-angled corners.
Since the rectangle doesn't have any rules regarding the length of the sides, all sides could be the same length, and it would still be a shape with for sides, and four right-angled corners. Answer: The set of all shapes meeting the criteria for "Squares" is included in, but not convergent with, the set of all shapes meeting the criteria for "Rectangles"
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