Anchor: For instance, nitrate levels in surface waters are not significantly improving, and at best are constant.
Entailed: Nitrate levels in surface waters are at best content, and not significantly improving.
Contradiction: For instance, nitrate levels in surface waters are improving significantly, and at best are very high.
Contradiction: The van is parked down by the river.
Contradiction: A man plays a harmonica
Contradiction: Studies or pooling do not help predictions.
Contradiction: The child is outside.