Anchor: Obsidian is a hard, vitreous volcanic rock, which could be fashioned into tools for cutting and stabbing.
Entailed: Obsidian is a rock that can be used for tool making.
Contradiction: Obsidian is a powdery rock with little use.
Contradiction: The young boy was watching soccer on tv
Contradiction: A person is wearing red.
Contradiction: A man prays in church.
Contradiction: a child is admiring a train set that rolls around the park