If a shape is a square, it always has the properties of a rectangle, and a little bit more.

However, if a shape is a rectangle, then it's never a square.

If a shape is a square, it always has the properties of a rectangle, and a little bit more.

However, if a shape is a rectangle, then it's never a square.

Old question, but,

All squares are rectangles. Not all rectangles are squares.

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