Text: Inside, there was no reason either for local Giovanni Pisano to show false modesty about his superbly sculpted 14th-century marble pulpit (left aisle), arguably the cathedral's masterpiece.
Entailment: Giovanni Pisano's superbly sculpted 14th-century marble pulpit is arguably the cathedral's masterpiece.
Contradiction: The 14th-century marble pulpit is in the right aisle of the cathedral.