Anchor: It would be shorter once you got the hang of it.
Entailed: It would be shorter in length as experience grows. 
Contradiction: The more someone gets used to a process the longer it will take them to finish. 
Contradiction: Black students have fun in a classroom.
Contradiction: A man stands beside his car.
Contradiction: I think there is nothing stopping us from doing that.
Contradiction: There are humans playing a game.