Anchor: Before the modern Sevila was built behind its crenellated wall, Celtiberians settled in the area and are credited with having sculpted the crude stone statues of bulls and pigs around the city.
Entailed: Celtiberians settled in the area before the modern Sevilla was built, and they are credited with having sculpted the crude stone statues of pigs and bulls around the city.
Contradiction: Celtiberians never settled in the area.
Contradiction: No matter how old people get they never forget. 
Contradiction: Eliminating the rule has a downside.
Contradiction: There's no way to install a profit motive.
Contradiction: A man plays a brass instrument.