Anchor: The problem of watering crops was solved by the irrigation system known as levadas simply-designed water channels that wound down from water sources on the verdant mountain tops.
Entailed: There was a problem associated with the watering of crops.
Contradiction: There was no solution to the problem of watering crops.
Contradiction: The cyclist is is wearing his roller skating clothes.
Contradiction: Some proposals for individual accounts allow voluntary participation.
Contradiction: The man is flying his airplane over the ocean.
Contradiction: The man walked by the wall.