Problem: S1: The eastern part of Chaoyang is home to a mountain that has been called Fenghuang Mountain since ancient times .
S2: The eastern part of Chaoyang is home to a mountain that has been called the Fenghuang Mountain since the ancient times .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: David Barclay was the son of Sir David .
S2: David David was the son of Sir David Barclay .

Do S1 & S2 convey the same information?

A: no

Problem: S1: About 90 % of all tobacco produced in Canada is grown here .
S2: About 90 % of all tobacco grown in Canada is manufactured here .

Do S1 & S2 convey the same information?

A:
no