Anchor: A woman mountain biker with a backpack bikes up a hill.
Entailed: a woman mountain bikes
Contradiction: a man is mountainbiking
Contradiction: Guam is not a territory of the United States, which doesn't include Alaska either, as it has been sold back to the country from which it was originally purchased, and at a low price. 
Contradiction: The dog is running outside
Contradiction: We never get the opportunity to bring home a computer, just floppy disks.
Contradiction: Three animals play on the beach.