Anchor: In adopting the H-2A program, Congress sought a balanced program that would ensure an adequate source of labor, but would not exploit employees or provide an added incentive to hire foreign rather than resident workers.
Entailed: Congress's goal was to find a way to avoid immigrant workers getting preference. 
Contradiction: The point of the plan was to discourage employers from hiring domestic workers. 
Contradiction: The surfer bobs in the water.
Contradiction: Conrad went to the light the gas.
Contradiction: He was short and ugly.
Contradiction: More than one child is sitting against a fence.