It's a counterexample.
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A counter example is a statement that shows conjecture is false.
A conjecture should be testable. You test it and if it fails the test, it is a false conjecture.
A mouse is a mammal, but it us not a monkey.
Because that is what a conjecture is! It is a proposition that has to be checked out to see f it isalways true, false or indeterminate,sometimes true, false or indeterminate,never true, false or indeterminate.Once its nature has been decided then it is no longer a conjecture.
Every four sided figure is a quadrilateral which includes a parallelogram.