Anchor: Self-guided heritage walks and several nature trails are marked by black information plaques.
Entailed: Black information plaques mark some nature trails.
Contradiction: The heritage walks do not have any plaques to guide visitors.
Contradiction: They're bad, they're awful, they're terrible.
Contradiction: Tommy's heart sped up.
Contradiction: A group of people are gathered indoors.
Contradiction: A school teacher is showing a picture to his students.