premise: Little girl blows bubbles in a public square. hypothesis: Little boy blows spit at people who walk by.
contradiction: There can either be a girl or a boy. He/she can either be blowing bubbles or spit.|contradiction: Girl and boy are contradictory genders. Spit and bubbles contradict one another, in that one (spit) creates the result of another (bubbles).|contradiction: It is either a girl or a boy. Bubbles and spit are two very different things to blow.