Anchor: but i don't know whether they'll be far enough up where they can do any good
Entailed: I don't know if they will be good.
Contradiction: They have always been good. 
Contradiction: The boys are eating the fruit before they get home.
Contradiction: The monk is carrying a mop.
Contradiction: A man skiing down the slope.
Contradiction: Other options had to be considered if the design team can't meet the exit criteria.