Problem: S1: Central forces that are conservative can always be expressed as the potential gradient of a negative energy .
S2: The conservative central forces can always be expressed as a negative gradient of a potential energy :

Do S1 & S2 convey the same information?

A: no

Problem: S1: Sometimes the term is used in exclusive reference to Mexico & Guatemala .
S2: The term is sometimes used in exclusive reference to Guatemala and Mexico .

Do S1 & S2 convey the same information?

A: yes

Problem: S1: The organization encouraged Islamic unity and cohesion , while promoting American ideals .
S2: The organization promoted Islamic unity and cohesion while promoting American ideals .

Do S1 & S2 convey the same information?

A:
yes