premise: A man holds a 4-wheel cycle for a little boy in a blue helmet as the boy holds a tool to fix it in a garage. hypothesis: A man holds a 3-wheel cycle for a little boy in a black helmet as the boy holds a tool to fix it in a garage.
contradiction: If the cycle has is 4-wheel then it cannot be 3-wheel, also if the boy's helmet is a solid blue color then it too cannot be something else such as black.