Anchor: Commenters stated that a date stamp would be meaningless to many installers and users, but that a letter stamp would be much more informative.
Entailed: Date stamp is meaningless to many users but a letter stamp is more informative 
Contradiction: A date stamp is better than a letter one
Contradiction: There is an animal playing on mars.
Contradiction: At least twenty thousand of them were sacrificed.
Contradiction: Among the four programs, merger discussions discontinued and 2 of the programs did vote in favor in march 2000.
Contradiction: a man in a jacket