Anchor: Finally, they are also an excellent means of communicating the essence of practices that have worked well by capturing the context as well as the specific practice.
Entailed: They are an excellent means of communicating; they've worked well. 
Contradiction: They are a terrible means of communication. 
Contradiction: Over a quart for every fifty miles.
Contradiction: The lack of a radio made things much easier.
Contradiction: He was sure.
Contradiction: A man in coat walks a animal as a bus passes.