Anchor: Obviously, the institutional structure of the U. S. government had everything to do with the spread of the postal network.
Entailed: The postal network spread due to the institutional structure of the U. S. government.
Contradiction: The institutional structure of the U. S. government had nothing to do with the postal network. 
Contradiction: A man is fast asleep in his bed.
Contradiction: A woman laughing and having fun.
Contradiction: We are not having a conversation right now.
Contradiction: There is a large screen on the stage.