Problem: S1: An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum . Common types of optical waveguides include optical fiber and rectangular waveguides .
S2: An optical waveguide is a rectangular structure that guides electromagnetic waves in the physical spectrum . Ordinary types of optical waveguides include optical fibres and optical waveguides .

Do S1 & S2 convey the same information?

A: no

Problem: S1: Natalia Falavigna da Silva ( born 9 May 1984 in Brazil ) is a taekwondo athlete from Maringa .
S2: Natalia Falavigna da Silva ( born May 9 , 1984 in Maringa ) is a taekwondo athlete from Brazil .

Do S1 & S2 convey the same information?

A: no

Problem: S1: After a two-year stint in Chicago , Doss commenced his professional career in January 1986 as a member of the Metropolitan Opera in New York City .
S2: After a two-year stint in Chicago , Doss began his career in January 1986 as a member of the Metropolitan Opera in New York City .

Do S1 & S2 convey the same information?

A:
yes