Anchor: At the very crest of the hill, you will find the Old Observatory, the only building designed by James Craig left in the city; it was completed in 1792.
Entailed: The Old Observatory is the only building designed by James Craig that is still standing.  
Contradiction: There are no buildings left that were designed by James Craig.
Contradiction: James Craig was not known to design buildings.  
Contradiction: You could never keep the puppies clean.
Contradiction: Letter-size pieces are rated lower than flat ones, according to the rate structure.
Contradiction: His stay was very long.