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If a polygon is a rectangle, then it has four sides. (Inverse)
If a polygon is not a rectangle, then it does not have four sides.
If a polygon is a rectangle, then it has four sides. (Converse)
If a polygon has four sides, then it is a rectangle.
If a polygon is a rectangle, then it has four sides. (Contrapositive)
If a polygon does not have four sides, then it is not a rectangle.
If you are a human, then you are a vertebrate. (Converse)
If you are a vertebrate, then you are a human.
If you are a human, then you are a vertebrate. (Contrapositive)
If you are not a vertebrate, then you are not a human.
If you are a human, then you are a vertebrate. (Inverse)
If you are not a human, then you are not a vertebrate.
If Susan is hungry, then she eats a snack. (Converse)
If Susan eats a snack, then she is hungry.
If today is Wednesday, then yesterday was Tuesday. (Contrapositive)
If yesterday was not Tuesday, then today is not Wednesday.
