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If the angles are supplementary then the sum of two angles is 180 degrees.
If the sum of two angles is not 180 degrees then the angles are not supplementary.
If the angles are not supplementary then the sum of two angles is not 180 degrees.
If 4 is divisible by 2 then 4 is an even number.
If 4 is an not even number then 4 is not divisible by 2.
If 4 is not divisible by 2 then 4 is not an even number.
If the angles are complementary then the sum of two angles is 90 degrees.
If the sum of two angles is not 90 degrees then the angles are not complementary.
If the angles are not complementary then the sum of two angles is not 90 degrees.
If I attend the meeting then it will be sunny outside.
If it will not be sunny outside then I will not attend the meeting.
If I don't attend the meeting then it will not be sunny outside.
If two angles are congruent then the two angles are vertical angles.
If two angles are not vertical angles then the two angles are not congruent.
If two angles are not congruent then the two angles are not vertical angles.
If 3 is a prime number then 3 is an odd number.
If 3 is not an odd number then 3 is not a prime number.
If 3 is not a prime number then 3 is not an odd number.
If the quadrilateral is a square then the quadrilateral has four right angles.
If a quadrilateral does not have four right angles then the quadrilateral is not a square.
If the quadrilateral is not a square then the quadrilateral does not have four right angles.
If the angle measures 1800 degrees then the angle is straight.
If an angle is not straight then the angle does not measure 180 degrees.
If the angle does not measure 1800 degrees then the angle is not straight.
If the angle measures 90 degrees then the angle is right.
If an angle is not right then the angle does not measure 90 degrees.
If the angle doesn't measure 90 degrees then the angle is not right.
If 5 is an odd number then the sum of 2 and 3 is 5.
If the sum of 2 and 3 is not 5 then 5 is not an odd number
If 5 is an not odd number then the sum of 2 and 3 is not 5.
It is done.