Anchor: In recent years an external measurement system for First-Class Mail has been developed and one now exists for Priority, but actual service levels for most other subclasses have been a great unknown.
Entailed: Other than First-Class and Priority, the actual service levels of most other subclasses isn't known. 
Contradiction: There is a detailed systems for measuring the service levels of all classes of mail. 
Contradiction: Information about nicotine addiction and health hazards has always been taken seriously.
Contradiction: a girl is folding
Contradiction: The men are driving in their car.
Contradiction: A group of people are on a subway.