Anchor: First, the mailer may be able to do in one step what the postal service does in two or more steps.
Entailed: The mailer does what the postal service but quicker.
Contradiction: The postal service is quicker than any mailer.
Contradiction: Everyone is ignoring the man in the shorts.
Contradiction: A man is playing a guitar.
Contradiction: She walked past the baker's and didn't buy any new buns.
Contradiction: My girlfriend goes for the social aspect and walks around and talks to people.