Anchor: In that case, Customs must stamp the receipt, and you must return it to the shop by mail upon arriving home.
Entailed: If that happens, you have to mail it back to the store when you get home.
Contradiction: In that case, Customs will destroy your belongings.
Contradiction: Nobody is marching
Contradiction: The dog runs outside.
Contradiction: They are unaware of the dangers.
Contradiction: a dog is playing in the snow