Anchor: Estimated date of  May 1998 (but that could slip).
Entailed: It happened sometime in May 1998.
Contradiction: It definitely happened in May 1998. 
Contradiction: Two children play soccer in their backyard.
Contradiction: The Madeira and Azores colonies were the beginning of the Portuguese empire.
Contradiction: A person on a motorbike rides on a trail through the water
Contradiction: Where is it that you grew up?