Every mouse likes cheese - There exists a mouse which doesn't like cheese., Every angle of the square is right angle - There exists an angle of a square which is not right angle., There exists an obtuse triangle - None of the triangles are obtuse, There exists a deltoid which is a rhombus. - None of the deltoids are rhombi., None of the angles of the regular pentagon are rigth angles. - There exists an angle of the regular pentagon which is right angle., 9 has at least 3 divisors. - 9 has at most 3 divisors., 3 is smaller than Pi - 3 is greater than Pi, Every triangle has a circumscribed circle. - There exists a triangle which doesn't have a circumscribed circle.,





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