Anchor: If his theory were true, Edmund Hillary's ascent of Mount Everest would have been motivated by a desire to test new oxygen tanks, and Joshua Slocum would have circumnavigated the world in order rack up frequent-sailing miles.
Entailed: His theory is a ridiculous one and should not be taken seriously.
Contradiction: His theory is one hundred percent true.
Contradiction: It's a good idea to invest in a company based on their past performance.
Contradiction:  Economic intercourse is about as deeply ingrained in the human brain as any other form of intercourse.
Contradiction: the dog is dead
Contradiction: The 11th-century donjon is particularly interesting.